Alright, I'm lookin' a flowmaster exhaust systems for my IROC. Does anyone have the "American thunder" system? How does it sound? Does it make a difference in power?

 

Check www.summitracing.com , it will definately add some power over your stock setup.

 

I put the American Thunder 3" system on my Iroc last weekend. I can't honestly tell you the difference since I also put on headers and cats, but I have a whole lot more throttle response now. I'll be taking it to the track soon to compare times.

It seems like every day I start it, it gets louder. When I first started the car after installing it, it was very quiet, more quiet than my gf's 2001 Eclipse. But after about 100 miles, it's definately louder. It has a *really* deep bass tone at idle, and opens up to a roar at around 2500 rpm and WOT. My gutted cat/40 Series muffler combo was louder, but it wasn't a smooth sound like I have now.

HTH

 

Thanks for the info, I think I'm sold on an American Thunder now

 

Anybody out there running a Force-II exhaust? I'm curios to know how it sounds. I'm a little worried about the interior resonance of the American Thunder exhaust. I would like to be able to hear my stereo while cruisin', so the full boar exhaust kind of makes me nervous.

 

While cruising I can actually hear my stereo easier (and hold a conversation) with the American Thunder as opposed to the 40-series muffler. The interior resonance at idle right now is louder, but that is probably part due to a couple pipes still rubbing the frame in places.

 

seems like my series 80 did the same thing...i rolled it out of the exhaust place and i was pissed i wasnt even sure if they put a flowmaster on it...after driving awhile it keeps getting louder and louder now with the headers its to loud...oh well what can you do

 

PUt a straight pipe in and it is loud...did mine last weekend and i just want to go out side and rev my car to listen to it...its sweet....now i cant wait to drive my car anytime

 

I got the AT and like it, but I think it's not as loud as it should be, Im going to in stall my Random Tech High Flow Cat thats just sitting around in place of my stock cat as soon as I get back from Germany (been here over 2 months ) I think that should make it a little more of my likeing.