03sonicgt

It means they agree.

Albizo66

the +1 means "i agree" or something along those lines...and you don't lose power by going with a too large diamter exhaust, it just pushes your powerband up, you still gain power, but it's just higher in the rpm's.

rbstang

because were to lazy to type the same thing... so we type +1

KALEL12

Mine has 3" exhaust. I didnt put it on there though. The lady that owned it before me did it. She also put on MagnaFlow exhaust which I am not fond of. But it has a decent sound. Power wise I couldnt tell you cause this is the first Mustang I have ever owned. The only thing that was done right was the fact that it is all stainless steel.

I would also like to add that 3" exhaust hits the chasis and makes an annoying knocking noise on bumpy Louisiana roads. I had the dealership heat the pipes up and try to bend them. It helped but didnt solve the problem totally.

stangc83

can you order a cat back with 3 in for the gt?? i have never seen one. but you can get the 3 in tips or 3 1/2 tips if you want. but there would not be enough backpressure with 3in pipes

KALEL12

First I would like to say that you and I have the same car? Does yours have tan leather interior too?

Anyway, I do not believe Cat Backs were included in the install.