Just wondering what others are using for catback systems on their forced induction engines. I'm considering a 4" Mufflex system.

 

Cant go wrong with that ... Im about to be in the same boat as you. Im buying a D1SC, and need a new muffler ... I thought about ripping the cat back off, putting a Flow Master Race Muffler on, and dumping it at the rear axle but ...

There are a few guys who have done pretty well with a hooker cat back and FI. They seem to flow really well for a cross flow.

Borla with an open plate is good.

And you cant go wrong with a GMMG.

I would imagine a Loud Mouth would flow nicely too.

 

I have GMMG... Anything with a good straight through design (no flow restrictions) is good... The bigger, the better.

 

I will be using LM with bullet muffler.

 

Anyone do a before and after dyno of a good catback versus true duals on a blower/turbo car?

Just wondering if they are as "needy" of a highflow exhaust as a NA motor is ...

 

I run SLP TOTL
Straight through design and awsmoe sound

 

They are actually "more needy" because there's more air to get out of the exhaust. You'll pick up more power going to a good catback with a FI car than with a NA car.

 

There is a thread about header design in the Advanced tech forum. rskrause posted a really good article on exhaust that you may benefit from reading. It was enlightening, at the very least.

Jeremy

 

Thanks Jeremy, was a worthwhile thread.

 

Yuck. Both mufflers they offer suck a fatty. Spintech and Flowmaster are garbage. Get the Mufflex piping and install a Magnaflow muffler. Also, I had good luck with a 3" Aerochamber cat-back up to 550 rwhp.

 

Guy I spoke with wouldn't sell just the piping although that's what I wanted originally. What's wrong with the Spintechs? I was also considering the Corsa. Since I'm looking for about 600RWHP, I want a good free flowing system.

 

So Mike, what I think you are saying is that you don't think the Mufflex mufflers are any good?

Jerry

 

You're pretty good at reading between the lines

I've had way too many dyno and track experiences with both SpinTech and FlowMaster. In my opinion, if you gain more 2 mph or 20 hp when you remove a muffler, then the muffler is no good.

 

Mike, you ever do a dyno pull with your hooker, and then without? To see how much that muffler was holding you back at that 550RWHP level?

 

Yep. 545 rwhp through the full 3" Aerochamber cat back. I removed it at the Y-pipe and it made 550 rwhp. Results weren't so great at the 700 rwhp level.