I'm sure there is some restriction but on street cars the loss is probably not enough to notice. Seems like the factory AAR's and TA's ran them that way at the races so must not have been that bad.
If your trying to get every little ounce of power on the street then I would say scrap any mufflers and run straight pipes all the way.....my opinion only.
I think the look and the sound is more important on a street car anyway..... not to many places on the street where you would want to test your 1/4 mile times. ](*,)
Mop
