exhaust...
02-21-2007, 12:38 AM
#12
Senior Member
Join Date: Oct 2003
Location: Reno, NV
Posts: 121
You need to run a dual system. Run it with big pipe through one muffler, and out a cutout, then after the cutout, neck the pipe down and run it through a second muffler so you dont get pulled over on the street. Thats what I did with my 12abp. You throw enough muffler on there to make it "ticket" free, and the thing doesnt make any more power. I used an electric cutout so I didnt have to lay on my back.
02-28-2007, 05:41 PM
#14
Senior Member
Join Date: Oct 2003
Location: Reno, NV
Posts: 121
Originally Posted by heretic' post='860430' date='Feb 21 2007, 04:22 PM
What did you do about retuning the engine for the different exhaust characteristics?
02-28-2007, 06:17 PM
#15
Senior Member
Join Date: Jun 2004
Posts: 524
Originally Posted by Stock Josh' post='861577' date='Feb 28 2007, 03:41 PM
You dont haha. You tune it for the one you want to make power on, the loud one. The quiet one is just to avoid tickets haha.
It seems such a shame to tune the car to be optimal for 1% of the time, then suffer with poor economy and drivability for the other 99%. There is a better way.
03-02-2007, 09:39 AM
#17
Senior Member
Join Date: Oct 2003
Location: Reno, NV
Posts: 121
Originally Posted by heretic' post='861585' date='Feb 28 2007, 04:17 PM
It seems such a shame to tune the car to be optimal for 1% of the time, then suffer with poor economy and drivability for the other 99%. There is a better way.
03-07-2007, 12:40 AM
#18
Junior Member
Join Date: Feb 2007
Posts: 10
Got so much info right there. Thanks guys! I'm building mine, too and these tips will help a lot!
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Mazda 5 Accessories - Download The 2006 Mazda 5 Accessories Catalog by Mazda USA
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Mazda 5 Accessories - Download The 2006 Mazda 5 Accessories Catalog by Mazda USA
03-16-2007, 08:34 AM
#20
Fabricator
Join Date: Jan 2004
Location: Central Ohio (Hebron) Zephyrhills Fla.
Posts: 1,322
Originally Posted by heretic' post='859910' date='Feb 19 2007, 06:53 PM
I wonder how beneficial it would be to cut a section of floor out behind the passenger seat and raise it up, to allow for more exhaust clearance to go over the axle. Once you're over the axle, it's a straight shot back anyway.
Or, to get really crazy, eliminate the passenger seat and run the exhaust through the passenger area, suitably enclosed of course.
I recognize that it's somewhat common practice, but routing the exhaust under the axle just seems like a bad idea somehow.
Under the axle is common in road racing because you only need about 4" of total travel. Most people limit the suspension travel so that the coil over springs don't come off the mounts on the shocks.
But you can make up a nice half loop to go over the axle housing by going to NAPA or a muffler shop and have them bend up some 90 degree sections for you. NAPA has them up to 4" for truck exhaust systems, and that is what I use.
You just weld up the pieces and go. Remember the limited space, so you may want a joint close by the loop to make installation a breeze. Many racing catalogs also have such bends for sale.
Lynn E. Hanover
In the picture note the exhaust pipe size ahead of the rear wheel. The whole system is above the location of the floor in the stock car.
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