I have the SLP loudmouth Exhaust on my car and it sounds great and i already ordered an SLP Y-pipe but i am wondering how much louder it is going to make the car and how much difference in performance i will notice. Thanks

 

Your car will sound very..very loud. Try to imagine open headers directly under you and you've got it! I'll be going with Bassini for my setup.

 

When I had an SLP y-pipe, it deepened the tone of the LM. Maybe freed up a couple of hp.

 

Just changing the y-pipe really doesn't make the system too much louder. I picked up a couple hp, but didn't notice any difference in the tone or sound level of the exhaust. The only way to make your car louder without headers is to remove the catalytic converters.

 

I've heard the difference and it sure was eveident to me and both times the cats were on the car.