i have a 377 sbc that produced 488 hp on the dyno with 1 3/4 open headers. i am looking for info. on which cat back system will flow this engine the best. i have no cat on the car. i am not so interested in the sound as much as i am interested in making the hp that is available. i have the slp 1 3/4 headers waiting to go on the engine. i have the flowmaster 3" american thunder system on now. it sounded very good with the old 305, but has a strange sound in the muffler with the new engine. thank you

 

Well, on a dyno using a 406 the Hooker Cat-Back outflowed several cat-backs, including the flowmaster. I'm very happy with mine. Though if emissions aren't a concern I would look into duals with an X or H pipe and using maybe some Flowmaster single chamber mufflers.

Oh, you said you weren't interested in sound, but I have a sound clip in my signature.

 

A couple of months ago I would have said Flowmaster, But after switching to a hooker aerochamber, I'd say hooker is the only way to go. I definately gained power all the way across the board after putting this thing on.

 

The best cat-back would be a 3inch piping with a straight through designed muffler especially with the horses your makin. Flowmaster is not the way to go because of it's baffled designed. A transverse designed cat-back muffler as i've been told is not very efficent either. If you want the most torque and horspower go with what i said.

 

Flowmaster single chamber is a straight thru design right?

 

flowmaster is not a chamber design but has these wierd little baffle thingies in there dude

 

Even with one chamber it's still not straight through because it's got all those wacky baffles in there. Straight through is the way to go! Later dude.

 

SLP "2 on the left side"