Hey guys I installed a 2.5 true dual catback exhaust with some test pipes and it actually made my car slower anyone know why?

 

prob cause you need a tune to get gains out of them. and plus test pipes moves your torque curve higher in the RPM range. you will be faster top end but daily it will be slower.

 

how do you know your car is slower? that is a good 20+HP gain

 

Probably running like dick since you didn't get a tune... Uprev can help

 

And you know this how, seat of the pants? Having little restriction in your exhaust system you've lost low end torque and from my experience you're running extremely lean. An Osiris tune will correct where the torque comes in and you'll continue to f'up the air we breathe!
Gary