I would of thought that it wouldn't make a lot of difference and certainly not reduce performance as the screamer pipe is only in effect when the wastegate is open.
By then you are up to full boost and at this point there is more than enough back pressure created by the turbo etc.
I have been running a screamer pipe on and off a bit for the last year, primarly because I was seeing an increase in backpressure through the Apexi exhaust when boost was right up and due to a bit of turbo stalling when running a bigger exhaust wheel.
Off the cuff I would say acc. was up but it lost it at top end, we used it mostly for 1/4 mile. It was fun sounded menacing and I recon had the added benifit of blowing hot air into the path of any left hand lane cars
I ran the exit to just behind the N/S/F wheel at the side skirt, was fun but the neighbours hated it
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