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Old 08-12-2012, 07:58 PM   #1
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True duals or c pipe

Recently ran true duals with cats ( went to a muffler shop instead of my mechanic that's why cats are on) Anyway I'm getting them taken off and thinking about an x pipe. What's a better option here in terms of over kill to the muffler (flowmaster 40 series are on now) also will I need heat shields where the cats used to be
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Old 08-12-2012, 08:55 PM   #2
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Re: True duals or c pipe

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Originally Posted by Dtibbz22 View Post
Recently ran true duals with cats ( went to a muffler shop instead of my mechanic that's why cats are on) Anyway I'm getting them taken off and thinking about an x pipe. What's a better option here in terms of over kill to the muffler (flowmaster 40 series are on now) also will I need heat shields where the cats used to be
True duals are or should be a thing of the past.
An H or X-Pipe works better and sounds better too IMO.
Their purpose is to smooth out the exhaust pulses which promotes a better flowing exhaust system.


You won't need heat shields where you remove the cats unless the exhaust runs really close to something that needs shielding. The cats build a lot more heat than a straight piece of pipe.
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Old 08-12-2012, 09:06 PM   #3
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Ran true duals because I figured it would be easier to change. Anyway I would like to do an x pipe, however should I go smaller in diameter for back pressure without cats so I don't get that motorcycle sound at higher RPM. Or stay equal and/or greater then the piping now. I'm also thinking bolt on instead of welds for future dump outs.
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Old 08-12-2012, 09:26 PM   #4
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Re: True duals or c pipe

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Ran true duals because I figured it would be easier to change. Anyway I would like to do an x pipe, however should I go smaller in diameter for back pressure without cats so I don't get that motorcycle sound at higher RPM. Or stay equal and/or greater then the piping now. I'm also thinking bolt on instead of welds for future dump outs.
No do not go smaller you don't need the back pressure.
Run 2.5" pipe.
There is an article on exhaust in the Useful Info thread.
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Old 08-12-2012, 09:30 PM   #5
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Yeah 2.5 and u could use 3" tips
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Old 08-16-2012, 08:19 PM   #6
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Anyone know if running true duals with no cats is harmful. I found out that heatshields don't like them with cats.
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Old 08-17-2012, 10:22 AM   #7
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My 89 has true deals without cats on them and it runs fine as long as the o2sensors are still there. I'm gonna do a x pipe someday too.
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Old 08-17-2012, 06:27 PM   #8
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Running divorced pipes hurts performance. Even with a crossover mid pipe it is still "true" duals. The crossover helps balance the exhaust and creates velocity getting rid of unnecessary back pressure.

---------- Post added at 06:27 PM ---------- Previous post was at 06:24 PM ----------

Quote:
Originally Posted by Dtibbz22
Anyone know if running true duals with no cats is harmful. I found out that heatshields don't like them with cats.
You would be better off cutting them out.
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