Most free flowing muffler
Hooker aerochamber. I have that catback, made 419rwhp 387ft lbs tq through the muffler....and 421rwhp 389rwtq through a cutout. It would say it appears that it flows pretty well. I have a dyno graph showing that as well.
My 570 Rwhp SS gained 1 rwhp and lost 4rwtq with a 3" open cut out over the Hooker cat back. In other words I lost power with the cut out wide open Vs. The closed Hooker cat back.
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I know a few that have 400+rwhp cars and tried TD's and lost not only torque but also power, bigger isnt allways better. Trial and error is the only way to find out what works best for your combo. If your running a stock cube motor with a small cam and bolt ons I would stick with the traditional style set up. Although you cant beat the sound of true duals it may not be the best performer your set up.
Some cars do benifit from true duals... my car picked up just under 50 Rwhp but im also running a lot more cubes and moving a lot more air than those guys were.
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
^^^Ummm...did they have a crossover? How about mandrel bends? If they just ran straight pipes off the headers, it's going to hurt them.
A 2.5" TD system with an X-pipe CANNOT be outperformed by an equally well-made y-pipe setup. It's completely impossible. A y-pipe simply cannot provide the scavenging an X-pipe can. You also don't want to go more than 2.5" on most setups for the LS1 because it'll sacrifice too much low end. A 400rwhp will perform much better overall with a 2.5" TD system, ESPECIALLY on the street. A 3" TD system will kill low end power. Go H-pipe for even more low end at the sacrifice of a few peak horsepower.
Your friends may have just had too big of exhaust piping for their applications or had a very poorly made crossover/no crossover at all.
A 2.5" TD system with an X-pipe CANNOT be outperformed by an equally well-made y-pipe setup. It's completely impossible. A y-pipe simply cannot provide the scavenging an X-pipe can. You also don't want to go more than 2.5" on most setups for the LS1 because it'll sacrifice too much low end. A 400rwhp will perform much better overall with a 2.5" TD system, ESPECIALLY on the street. A 3" TD system will kill low end power. Go H-pipe for even more low end at the sacrifice of a few peak horsepower.
Your friends may have just had too big of exhaust piping for their applications or had a very poorly made crossover/no crossover at all.
^^^Ummm...did they have a crossover? How about mandrel bends? If they just ran straight pipes off the headers, it's going to hurt them.
A 2.5" TD system with an X-pipe CANNOT be outperformed by an equally well-made y-pipe setup. It's completely impossible. A y-pipe simply cannot provide the scavenging an X-pipe can. You also don't want to go more than 2.5" on most setups for the LS1 because it'll sacrifice too much low end. A 400rwhp will perform much better overall with a 2.5" TD system, ESPECIALLY on the street. A 3" TD system will kill low end power. Go H-pipe for even more low end at the sacrifice of a few peak horsepower.
Your friends may have just had too big of exhaust piping for their applications or had a very poorly made crossover/no crossover at all.
A 2.5" TD system with an X-pipe CANNOT be outperformed by an equally well-made y-pipe setup. It's completely impossible. A y-pipe simply cannot provide the scavenging an X-pipe can. You also don't want to go more than 2.5" on most setups for the LS1 because it'll sacrifice too much low end. A 400rwhp will perform much better overall with a 2.5" TD system, ESPECIALLY on the street. A 3" TD system will kill low end power. Go H-pipe for even more low end at the sacrifice of a few peak horsepower.
Your friends may have just had too big of exhaust piping for their applications or had a very poorly made crossover/no crossover at all.
I agree though on the pipe sizing as a genneral rule of thumb. Like I said before, every car/combo will react differently to different mods. Some combos run better with a little back pressure and smaller pipe where others seem to like a free flowing race style set up. It also depends on the usage of the vehicle.
The X pipe isnt allways the better option than the H pipe ither. you need high flowing race style system in order for the scavenging affect to work. If your running a full length system with restrictive mufflers then your X pipe is nothing more than an expensive balance cross over. Some real world evaluation has also shown the H pipe to make better average power than the X in some cases..... its all trial and error.
Last edited by Jeremiah; Dec 2, 2007 at 09:16 PM.
On The Tree
Joined: Jun 2007
Posts: 136
Likes: 0
There's one guy on here that had much better luck with the Bassani true dual system than the catback he was using. (Borla I think?)
I think he gained 15 peak horsepower at the wheels.
That is the setup I will be going to next year.
I think he gained 15 peak horsepower at the wheels.
That is the setup I will be going to next year.