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Borla has 2 1/4" pipe......SLP has 2 1/2" pipe
SLP has mandrel bent piping vs. a muffler shop's crush bent piping
thats how......I dyno'd my car with my custom flowmaster setup and I had 133 whp. All I did was take that off and install the SLP and dyno'd again (same day) and I was at 144whp.........the proof is in the numbers. Then add S&S headers magnaflow h/f cat... DHP...CAI...pro-m maf...shift kit...and you get 175whp and a 14.7 second Alero
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