I've been looking on the web at the new IMCO performance mufflers that look like they would flow pretty good but I have never heard anyone on any of the sites that I read talk about them. I see that Holley/Flowtech also makes a Raptor muffler that is supposedly for performance. Anyone run them? They don't look as good as the IMCO though in construction.

Please limit responses to the IMCO and Raptor. I have noticed that whenever someone asks a similar type of question, the forum ususally turns into a discussion of what most users have on their ride. I know all about Flowmaster, magnaflow, dynomax, etc. There are hundreds of reponses about them.

Thanks,
Clyde

imco typical chambered muffler,open case with a resonator baffle thingy..cheaper than most good for "i'm on a budget" scenerio....

just gotta do it,,i've got flowmasters.
shane

I have IMCOs with 3" all the way to the rear bumper, they sound awsome all the time but on the loud side under a heavy load, but I really like them

Bump

I use raptors on my engine test stand cause they were cheap... if your lookin for a mean sounding muffler these are not for you. they work well on my stand cause they are quiet and I can hear the engine

I have IMCO 2 1/2 on my chevelle, I am just replacing them now that I am doing a frame off. I thought they were loud when I got on it, louder than I personally care for. Had a nice rumble to them, but too loud. Although I should say, when I took the body off I found numerous holes in the floor that may have contributed to the loudness in the car.

As far as construction they seem well put together, I have had my car 6 years now and they were on it when I bought it, they are still in good condition.

Jeff

I am running a single offset/center 2.25" in/out Flowtech Raptor on my 2006 HHR. Good mellow tone, not all pitchy like alot of mufflers sound on 4 bangers.

It was alittle louder at first, but mellowed with mileage (about 500 miles).

Sounds really nice at WOT from a start or on the freeway.

Raptors are quiet. Noticed 2.5" necks down going into muffler.

Raptors are quiet. Noticed 2.5" necks down going into muffler.

That's odd, but I'd guess they use the same case for all their mufflers and the inlet/outlet pipe sizes are the only differences.

I remember clearly that mine neither got bigger or smaller going from the inlet/outlet into the case.

I'd bet that the 2.25" is the standard since its the most common size pipe size.

I called Holley and he said the After Burner was best 4 me instead of the Raptor. Have yet to put them on but looking through them I think he's right! :) It's a combination of a turbo and mouse trap design but yet straight thru. Hard to explain. Go to Advance Auto and PDQ a set and look at them.