I have just booked my car into Blueflame for a 2.5 turbo back system.
Now, he has told me that this includes the down pipe & sports cat. I said that i have already got a pre cat on my car which i got from .
The guy has said that they are still restrictive because of the 3 bolt flange, their systems are a straight through 90 degree pipe.
Is it true that the pre cats are still restrictive?