Ya i run them on my car they do help quit it down a bit and they did not slow my car down at all .
Pretty much just a straight pipe with a little bit of a baffle in them you can see straight thru them but they work good for me.
The best thing i like about them you can hear things happening in the car it did save me some major damage when i came out of the water box i heard some grinding noise at first i thought i broke the rear end so we back off towed back to the trailer come to find out i broke a tooth off of the planetary if i had launched the car it would have really been bad so ya they are good for a lot more than just noise.