Well i ran out to SevenSpeed today they had my car up. so i got to take a look under her. The exhaust is all Custom. It's all 3 inch stright back till about 1.5 feet before the muffler it widens out to 4.5 inch. It's a Greddy Muffler too. The guy's up there said the could tourch out a section and bolt a borla on. I guess that would make it a little less loud. What do you guy's think?



-=RX-7 KID=-

 

yes a borla xr1 in the exhaust will quiet it down

 

XR1 is hardcore, it will lower about 3 db on a 3" straight through exhaust.

it fits under the transmission tunel with no problem at all.

 

I did a compareson test last summer. Standing at about 50ft away (the California Law is limited to 90db at 100ft)

as you can see the XR1 is quite helpful. Compare to a straight through mid pipe, the XR1 is a lot quieter, and it is almost the same as having a high flow cat.



APEXi N1 Single with no silencer and stock cat at idle



APEXi N1 Single with no silencer and stock cat at appox 2500rpm



Generation 1 Trust SP with Borla XR1 at idle



Generation 1 Trust SP with Borla XR1 at 2500rpm

 

Rx7kid how have you made out? Did you end up putting the borla silencer in and if so how does the car sound now? I HAVE to start looking for a way to quiet mine down as well I have greddy power extreme which *used* to be quiet until I installed the midpipe. Now its a whole different story. Anyone else have a power extreme that they needed to quiet down?

 

The new power extreme is just not as good as the good old trust exhausts...

the further up towards the turbo you install a silencer the less droning you will get from the exhaust noise. If mid-pipe + power extreme, it can be pretty obnoxious

 

I've had the PE since 98. I've had it with the stock cat, mp and resonated mp. IMO it sounds like **** with the MP. However, a resonated mp will help a lot. My buddy has the SP with a stock cat and it sounds a lot louder and higher pitched (like a weed whacker) than my PE with the stock cat.



I'm about to switch to the RB dual with a high flow cat....much sweeter. The older I get, the quieter I want it. It's now my Wife's transportation to and from work. I really got the RB out of necessity - she's a cop and she got tired of ricer honduhs trying to race on the way home from work every night! LOL! no ****!



GEB.

 

I have been told that with a pre-silencer in the midpipe that it will sound almost like my car did before with the stock main cat which is fine by me. I am looking into a dynomax round muffler right now that summit sells for $70. I am still doing researh on it so ill let you know how I make out. Anyone have this set up or maybe has had experience with the dynomax race mufflers?