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After seeing the picture of the Intrepid underbelly that MadTxn posted in Dual Exhaust Question , I was curious if bbull had other pics of the Trep underbelly. Low and behold he did! Unfortunately the two other pics led me to another question. In both pic A

and pic B

you can see a a pipe connecting the two exhausts behind the oil pan. Does anyone know the purpose of this? Is is simply a homemade support, or is it to equalize the pressure between the exhaust pipes for some reason? Kind of curious about this, I am really wanting to go dually on my R/T's exhaust pipes, but want to know everything I can before I commit a few hundred bucks in the venture.

Hey Thrasher, on your DynoMax, did you go with a true dual exhaust, or did you leave the front resonator and replace from the original muffler to the back? Any pics of your Trep's modification from the underside? Do you know which DynoMax muffler you went with?

Man, is there a way to preview these topics before posting?
 

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That is a cross over pipe. It's purpose is to smooth the flow of exhaust and even out the cylanders (sorry about the spelling)pulses. This will increase horsepower. Another method is to use an X pipe which does the same thing but will give 10-17% more horse increase over the balance pipe (not 17% of total horse but 17% more than the straight pipe). If you are going to put on a Cat-back system you should definitely have a balance pipe. Contact Summit Racing to get more info (www.summitracing.com)

Good luck!! -- Dave
 

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That is a cross over pipe. It's purpose is to smooth the flow of exhaust and even out the cylanders (sorry about the spelling)pulses. This will increase horsepower. Another method is to use an X pipe which does the same thing but will give 10-17% more horse increase over the balance pipe (not 17% of total horse but 17% more than the straight pipe). If you are going to put on a Cat-back system you should definitely have a balance pipe. Contact Summit Racing to get more info (www.summitracing.com)

Good luck!! -- Dave
 

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Hey. That looks like a "true" dual exhaust :) My wuestion is, how did you do that? I checked Summit racing, and I could not find any Cat Backs for an Intrepid. I want a true dual, just like you show in the picts, can you post the order info? Thank you in advance. My 98 ES has 110,000 miles on it, so I am ordering a set of 18" wheels, a K&N filter, and I want to through some exhaust on it. Just to freshen it up a bit.

Erik
 

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110,000 on a '98. Wow. Thats alot of miles! My '94 only has 103,500.
 

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Reiton: Thanks for answering my question, I guess a balance pipe would be a wise investment. I'm glad I have this web site to ask these questions on. I want to be completely prepared when I take my car in for this work. I can just see the mechanic asking me if I want to include a balance pipe and I start stuttering and stammering like, "...uh, oh, yeah I guess..." Much better to at least APPEAR to know what I am talking about. :D You were right, the Summit website had some universal balance pipes here.

Thanks!
 

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JigSawMan, I'm glad I could help you out. I haven't started modifying my Trep as I'm working on rebuilding a '75 Vette. One thing I should mention. As you probably know, opening up the exhaust will build more horsepower, but it will decrease back-pressure. This will cause the torque to move higher up the RPM range. This means that off the line you car will be less responsive, but you will have a higher top end speed. To counter this you will need to vastly increase the amount of air/fuel you put in to regain the low end torque. If you want to increase the horsepower and keep the torque you might want to start off with a more open muffler, put on exhaust manifold heat wrap and duct some air from the front of the car to the airbox (or "Swiss cheese" the side of the airbox). This is a good place to start because you can always add the dual exhaust at a later time if you still want more horsepower. Since nobody seems to make performance parts for the Trep you'll have to fabricate and adapt parts to do this (I'll post any part info that I come across), but don't let me discourage you from going with a true dual (Cat-back) exhaust. Talk to your exhaust shop and let them know what you want to get out of you car (maybe a true dual but using 2.5 inch exhaust pipes to keep the low end torque).

Ejlarson, you are right, there isn't much available for the Trep but also keep your eyes open for 300M products. If you want to get a "Cat-back" system find yourself a good exhaust shop that can bend and weld the pipes for you. Hopefully sometime in the future someone will come out with products for us, but even if they don't the Trep is still a styling car that can hold it's own against most cars (OK the Z06 Vette and the Viper will still kick our butts, but I've blown most 4.6L Mustangs away at the light and at the 1/4 mile mark!!)

Good luck JigSawMan and ejlarson!! Keep us informed on your progress and if you do make the exhaust change, do a Dyno pull and tell us what you get.

Reiton (Dave)
 
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