OK so I saw this pic of an FB with the exhaust routed under the rear suspension, and was wondering if anyone out there had done this, and how I should route my exhaust like that.

i did this with mine. its pretty common on race cars. i remember like 10 years ago, a friend of mine did a back to back test of over vs under, and the bend going up and over makes less power.



there is less ground clearance going under, and it does limit the suspension droop (axle hits exhaust)



its also pretty simple to do, instead of bending up, the exhaust goes down slightly and under, muffler doesnt move much



anything over 3" wont fit

I'm doing 2-1/2", and when I build my ported motor just plan to add another pipe (with x-pipe) to keep it flowing nice https://www.nopistons.com/forums/pub...IR#>/smile.gif

how about instead of goin over... run to the side

muffler clearance is probably the issue..

theres one at the track, that has a short header, muffler, and a turn down, its loud, but not any louder than the other ones....



although if you run it to the rear, you do have more room for mufflers

Well I'm on my way to go do this now. My fart cannon hasn't arrived yet but I'm just going to run the bulk of the exhaust (straight pipe). **** expensive mufflers, and cheap mufflers don't last (which gets expensive). It's not my DD so straight pipes + fart can for me. We'll see if I can take it or if I puss out and get mufflers.

OK on the exhaust note, (no pun intended) I know the pacesetter header is garbage, but just how garbage?

i guess they vary in quality? ive got one that looks good except its not equal length, collector is nice, bend are nice



just be aware that header and only one muffler is going to be LOUD, the rotary exhaust opens much much faster than a piston and theres no exhaust valve in the way, so lots and lot of noise comes out.

Yeah, I know it's gonna be loud, I'm beyond the point of caring. I can't justify $100 / muffler to keep it quiet. Maybe later. Stupid extra-hot exhaust gasses...

a glass pack in the middle, works well and is cheap. it will burn out, but even burned out is quieter than a pipe

I'll do that then.

I made a 3" over the axle exhaust system with a $155 suppertrap muffler, And it is loud as hell!!

I am thinking about putting a moroso"spiroflow" muffler in the center of the exhaust to help keep the sound police off my ass. The spiroflow has no packing to burn out so I thought it might be a good choice....



Edit: plus there only like $50

Never heard of them. No packing? Do they even do anything then? Sounds like just a massive restriction.

They have vary little back pressure they have something that looks like a huge auger bit in side of a 4" canister!! I'll try and find you a picture of one....

Using advanced gas dynamics and sophisticated noise cancellation acoustics, Moroso engineers have developed a new series of Racing Mufflers. Specially engineered spiral baffles divide the exhaust flow into two separate paths, significantly reducing noise levels with minimal backpressure. The all-steel construction makes them durable – our efficient manufacturing process makes them affordable!

[attachment=44638:spiralflow.jpg]

look up hushpower mufflers on jegs. they seems to be real good. im going to order one for the my TII this week hopefully. there designed for v8's i think. but should work real nice on our cars...



oh...and i also routed my 3 inch exhaust under the axle. over just seemed stupid to me. and if you squish the part of the pipe that passes by the rear axle slightly nothing should touch and give better clearence. just a little will not hurt flow because the pipe opens wider in one direction.

Actually those Moroso mufflers make sense, but I've seen videos of them, and on V8's they were still loud. Might be worth looking into though. We'll see how unbearably loud it is without a muffler, and if it's too bad I'll just get in there with the sawzall...

V8 with a glasspacked is really loud also.

My friend has a 4G63T running 3" with a glasspacked and and a spiraplow. and when he welded in the spiraflow it made a significant drop in exhaust DB's...



Another muffler that cought my eye was the Borla XR-1 Race muffler. It has burn out resistant stainless steel packing, But they are three times the cost of a spiraflow.....



I'm going to have to check out those hushpower mufflers!!!

i like them also cause there flat black and available with a turn down oulet. and all the way from 2.5 in up to 5 in or bigger!



so theres always one that will fit...



i myself havnt used one, so i dont know if it will be loud or not. but im guessing it will be pretty good.

I checked out the hushpower at jegs. How do they muffle the exhaust..??? Do they have welded internal baffles?? do they have a perforated core and hight temp packing maybe..????





Hushpower 13016101 - Hushpower Pro Series Mufflers



The internal construction of Pro Series mufflers is T409 stainless steel and the outer case is fabricated from rugged 18-gauge aluminized steel. Pro Series mufflers consistently deliverer performance that is equal to or surpasses open pipe systems, while dramatically reducing sound levels across the RPM range. These round-cased mufflers deliver ground breaking sound control while delivering maximum power and exhaust system efficiency. The Pro Series mufflers work on all applications ranging from street trucks, diesel ''pullers'' and RV ''pushers'' to every class of racing on dirt or asphalt.

[attachment=44643:hush.jpg]



It kinda looks like a painted black fart can..??? witch is great in my book as long as it has something other then fiberglass packed inside of it. If it has stainless steel packing or maybe ceramic wool packing then this would be a badass muffler and worth the $190.....

im not sure, maybe you could contact JEGS and ask them? i dont want to wait on hold...lol



im betting stainless insides too. the one i seen was all black. it looks ugly with the non painted tip. and looks way better in the pic from the jegs catalog.

the borla's sound cool, and muffle ok, but are still loud, you cant just run the borla



the quietest muffler is the RB turbo back presilencer. its $$$$ though

See, I guess it all depends on what you consider "loud". Open manifold = loud. Getting a ticket every time you go for a drive = loud. But I can deal with noise, as to me there is no better sound than an engine over a radio.

yep totally. since im in ca, and mines not anywhere near smog legal, i cant be too loud.

so I did some research, The hushpower is a pretty cool muffler!



[attachment=44648:technology_splash.jpg]





Hot exhaust gases entering the tapered inlet section are actually accelerated as they pass through the perforated cone into the outer core area. The perforation pattern and entry angle are specifically engineered into each product to provide optimum airflow characteristics.



The sound energy is reflected and redirected back into itself as well as into the outer thermal core by the carefully selected taper angle of the entry cone.



The increased surface area and angle of the tapered exit cone provides an "easy exit" for the hot exhaust gases that encourages the flow out of the muffler. The carefully selected taper angle of the exit cone directs and focuses the sound energy back into itself. This convergence of sound waves reduces the sound level as it passes out of the muffler.



The muffler still has fiberglass packing, Oh well even if the packing does burn out, I bet that thing will still muffle pretty good without it.

damn...nice find. i guess your searching skills are better than mine. i couldnt find anything on it.



so whos getting it first? im definitly getting it. but not for 3 weeks or so. i set myself a limit to spend on the cars or i will be living on the street. and i past my limit this month...lol.

Man I feel that 100%... in the past 2 months I've spent over a grand on my car, not including buying the car. So I've spent roughly 2 grand in the past 2 months on my car lol...

Too rich for my blood... Having a kid has slowed thing down a bit.... But I can't give up my FB. I've had it for like 7 years, And I dont have much to show for it yet. Slowly but surly its (Ghetto rich) coming along....



I am almost done with my 13BT build so I'm checking out muffler options...

I think I'm going to go with a RacingBeat PowerPulse turbo muffler. I think it has ceramic wool packing.. and its half the price. But I still think that the flowmaster hush power muffler would out silence it any day!!!

oh if you're turbo, run the RB turbo back presilencer http://www.racingbeat.com/resultset....tNumber=16425P. turbo + that makes it quiet enough to drive on the street, the rear muffler, changes the tone. borla sounds race car, hks sounds droney, but quieter. etc

Found that same presilencer by it's self on the RacingBeats website without the pipes and flanges for $88... So I'm going to run one of those in the midsection, And keep my supertrapp on the back with 22-24 diffuser discs or none....

I have a pair of 3" dia Magnaflows on my turbo FB -- one in the front, acting like a presilencer, and the other in the rear. These things are straight thru with ceramic packing, and this setup is loud. With a passenger in the car, I have to talk very loud to hear her (or him). I think a real presilencer is a good idea. Very few people complain that their car is too quiet.

^^ I'm one of those "very few"

My car is definately not "too quiet". Straight pipe + cannon = loudness.



It's running really rich too for some reason.

i ordered the hushpower muffler yesterday from jegs. so in 2-3 my TII will be running it. from the turbo back is 3 inch with no cats or resonators. its crush bent tubing though. that will not affect the sound to much though...



i'll try and post up a sound clip...

FWIW, I run a crush-bent 3" pipe and just the Borla XR-1. I like the Borla. It's a tad expensive, but I'll never need another muffler. It's a little loud for a daily driver, but I'm not in the car that much, so the exhaust note is sweet music to my ears. I'm careful about where I push on the go pedal, so I've never gotten pulled over. I suspect that if I blasted past a cop at full throttle, he might think it was a little loud.

I got my exhaust on with just the cannon and it's reasonable at idle- the cannon actually quieted it down a LOT- I fired it up without the cannon in place to see how loud it was, and it was excessively excessive. Even with the cannon, anything above idle and it's way too loud. I'll be buying one of those Spiralflows soon and let you guys know what's up. My system is 2.5" mandrel bent, with RB header.



Oh, and I only got to drive it once. After I parked it, electrical gremlins got to my ignition system, and I haven't had time to trace it out. I have a hunch either the wire to the coil baked or the ignition switch itself, since there was "electrical-fire scented smoke". It's either one of those 2 or it's the damn ignitor. If the ignitor is it, GM ignitors here I come!

so i fired up, and drove the car with the Hushpower muffler. 3 inch all the way from turbo back.



I HIGHLY reccomend the Hushpower muffler.



i went from a 2.5 inch with a resonator and a cheapo muffler. to this set up... it atually is a little bit quieter, and a whoooole lot deeper. sounds beautiful.

ignitors just fail, they dont smell.



there is a secret fuseable link on the 79-80's in the ignition switch wiring

No I hard wired my ignition in since I swapped motors. A lot less hassle than trying to get my '80 wiring to work with my '83 disty. **** fuses and fusible links, at least until I re-wire the car this winter with a new mini-fuse box.



The smell was from a frying parking brake warning light wire... and my car wouldn't get spark because my hard-wired ignition wire wasn't getting power... I accidentally must've knocked the wire loose. :wallbash: So now I got it to start, but once again, it won't stay running. Carb still needs too much tuning. I think it's just running extra rich, and is loading up and dying at idle.

IT'S HOME! It was at my dad's shop, across town, where I was working on it. But today, I did a little ignition tune up- cap, rotor, wires, cleaned the plugs, and added grounds to the rotor housings (pics to come). It fires RIGHT up, and runs good. It still is running rich, and loads up below 3k at throttle, and it's idling high- about 1500, but it's running, and driving. Took the freeway home, no problems.



What a good ******* feeling.