I was wondering about my exhaust set up. I just put high flow cats on(dual cats) and I also went with no muffler, just stright pipes from the cats all the way to the back. I love how it sounds ecspecially when I step on it but I was wondeing if I lost horse power and torque by not putting a muffler on. A friend gave me his flowmaster set up from his camaro, Should I go with the flowmaster instead?

 

you have the same setup as i do.... dual cats and thats it! anyways your not losing performance by not having a muffler... so if you like the sound then stick with it! it'll probably sound better then the flowmaster....

if you scroll down i made a thread somewhere with an exhaust clip of mine...
https://www.thirdgen.org/forums/exha...aust-clip.html

 

I went with shorty headers with a 3" collector to a magnaflow 3" dia cat. I know a gut that ows a shop and lets me use his dino for free. I got an extra 23 horse and 27 lb ft - granted my can is not stock. I loved the way it sounded but was curious about the same thing as you. So, we tacked on a flowmaster 40 series and lost about 7 and 7. And even though its not much, it is still extra weight. i have about 2 ft of pipe after my collector, my cat and that's it; why ad the steel when you don't really need it?
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My cam is not stock. I have yet to alter my can.

 

Technically, no you didn't. All you did was move the powerband up. On a carbed or short runner intake, this isn't a problem at all because you can rev higher. On a TPI car running too short a "tuned" length of exhaust can hurt you by tuning the exhaust for a powerband that your intake can't reach.

But you should be alright, you still have cats and the pipes go all the way to the back right? I'd say you're fine.