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Exhaust 4.7L Exhaust Discussion


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  #11  
Old 04-15-2011, 11:04 AM
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Originally Posted by RAMING IT View Post
Im still running stock manifolds too. I have two stock precats on my Y pipe were my 02's are but the main cats gone. I got my 3" running all the way back to the stock rear corner panel. I hear that dumping them at the muffler sounds a bit more deeper?
dunno about deeper...but I can tell I piss people off passing them at WOT lol

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  #12  
Old 04-15-2011, 01:12 PM
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Truck sounds good! It does sound a bit deeper than mine. Was that an image of a rabbit on your dash after the "D" as one of your gears? I gotta get me a youtube acct.
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Old 04-15-2011, 01:51 PM
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Best for performance as far as exhaust would be true duals with x pipe, next best is true duals with H pipe, then either true duals totally separate or Y pipe are both good, Between the two, a Y pipe will provide slightly more low end and less top end, true duals not connected will provide slightly less low end than Y pipe but more top end. Pipe diameters get tricky....lol
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Old 06-09-2011, 11:25 PM
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I know this is an old thread, but i always thought traditional thinking was that a single to dual system is just for looks. Unless you have 2 cats, downpipes, mufflers, etc... the scavenging would be nearly the same & wouldn't improve your power band whatsoever.
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Old 06-10-2011, 08:58 AM
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There's two reasons bringing the exhaust pipes together is good. 1) when the left and right banks are connected down stream in the exhaust it equalizes the pressure and the motor runs more "even" from left bank of cylinders to right bank of cylinders. 2) This is the main reason, when you take two pipes, with gases flowing through them at a certain velocity, then merge the two pipes together into one, the velocity increases, and this helps "suck" the exhaust out of the engine, increasing power potential. "Back in the day" true duals were considered the best because everything came from the factory with two undersized down pipes from the manifolds slamming into each other (not a good flowing y pipe) into a single, even more undersized, exhaust pipe. Obviously, if you take your truck and take the down pipes from the manifolds and y-pipe them into a single, half inch exhaust pipe, that will not flow well, lol. Technology and availability/ease/affordability of aftermarket thrives nowadays.
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Old 06-10-2011, 01:03 PM
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Quote:
Originally Posted by snrusnak View Post
There's two reasons bringing the exhaust pipes together is good. 1) when the left and right banks are connected down stream in the exhaust it equalizes the pressure and the motor runs more "even" from left bank of cylinders to right bank of cylinders. 2) This is the main reason, when you take two pipes, with gases flowing through them at a certain velocity, then merge the two pipes together into one, the velocity increases, and this helps "suck" the exhaust out of the engine, increasing power potential. "Back in the day" true duals were considered the best because everything came from the factory with two undersized down pipes from the manifolds slamming into each other (not a good flowing y pipe) into a single, even more undersized, exhaust pipe. Obviously, if you take your truck and take the down pipes from the manifolds and y-pipe them into a single, half inch exhaust pipe, that will not flow well, lol. Technology and availability/ease/affordability of aftermarket thrives nowadays.
I'm sorry my question must've been a little ambiguous. I completely understand the purpose & benefit of a crossover on dual exhaust & how that effects scavenging. I'm wondering if there is performance advantage to adding a single to dual kit on a single exhaust setup. Basically, exhaust manifolds to single cat, single downpipe, single muffler with dual outlet and two exhaust tips. I know the kits look great, but it has always been my understanding this is a cosmetic upgrade, at least in hotrod/musclecar circles & was wondering if that was no longer considered the case.
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Old 06-10-2011, 01:11 PM
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Oh gotcha! This would not give any scavenging/performance benefits....basically same as just a single pipe all the way. Keep in mind though, you would usually have a y-pipe first where the down pipes come together, so would still benefit from that.
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