View Poll Results: Which exhaust would be right for me?
just adding a cutout
5
12.20%
replacing the slp/superturbo setup w/ Hooker cat-back
1
2.44%
Replacing everything with LT's, 3" catted y-pipe and hooker cat-back
35
85.37%
Voters: 41. You may not vote on this poll
When is my RWHP restricted with this exhaust setup?
Originally Posted by 300bhp/ton
2.5" duals have the ability to see slightly better PEAK numbers, but it probably wouldn't be by much at this level of performance.
But to answer the original question, and somewhat against the grain, MACs have been shown to give near idential peak hp numbers, but they giveup a handful of midrange tq. Again this is from straight back-to-back dynos, of which I don't have the graph with me.
However, MAC cats have been shown to be as restrictive as stock cats. And as long as you have a good y-collector, a 2.5" y-pipe to 3" collector is good for bolt on applications.
Superturbos have a 'S' curve internally, so they are slightly more restrictive than a straight through muffler. What I would do to save some coin, is just replace the muffler with a Magnaflow or Ultaflow muffler and be done with it.
So, to add a fourth option, have a custom y-pipe made with carsound highflow cats, and keep your MACs. The money saved in swaping them out may not be worth the few extra midrange hp you will see on a dyno.
Thread Starter
Joined: Jun 2002
Posts: 669
Likes: 1
From: Amarillo, TX
The high-flow metallic magnaflow(carsound) cats is what I have. The mac y-pipe was without cats when I got the car and I added the metallic cats. This was the reason I had the first option for just the cut-out, because I like it on the quiet side and with the cut-out, the restrictive muffler would be bypassed but still allow me quiet driving the rest of the time.
Does anyone know the exact part-number of the cats used in the pacesetter y-pipe from TSP or the cfm rating per cat?
I will probably still go with option 3 mainly because the mac's are so rusted that I don't think sanding and painting/coating them would be possible, that and I'm a bit of a perfectionist(OCD) and like things to be well put together instead of pieced together as is my current setup.
Does anyone know the exact part-number of the cats used in the pacesetter y-pipe from TSP or the cfm rating per cat?
I will probably still go with option 3 mainly because the mac's are so rusted that I don't think sanding and painting/coating them would be possible, that and I'm a bit of a perfectionist(OCD) and like things to be well put together instead of pieced together as is my current setup.
