This in it self will speed uo spool time if the down pipe and exhaust diameter is increased.I got to check out the MSP at Laguna Seca this last Sunday...I did look at the exhaust piping and it looked the same as the MP3...one thing that I did notice was that the downpipe on the MSP is TINY...2 inches at the most...I forsee a big increase in power by swapping out this crappy factory exhuast for a 2.5 or 3 inch turbo-back system.