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Old 04-04-2012, 08:02 PM   #18
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Join Date: Jan 2006
Location: Copperas Cove
Posts: 1,517
My Ride: HPF M3 stg 2.5
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Originally Posted by HPF Kirk View Post
We actually got the biggest gains I have seen (from exhaust change) on a Stage 2 car we had come through here about a month or two ago.. He had a full Magnaflow exhaust and made about 520whp on Pump and Meth... Well when we switched him over to the AP Mid-Pipes and AP Rear Section he made about 580whp with no change in the tune at all. I will try and find the Dyno sheets for this tomorrow. There might be a thread on this already....
borla is even more restrictive then the magnaflow, much more restrictive then all oem factory and factory muffler.
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