Sorry, people get all hyped about exhausts - expect to get 300 bhp because they bought a 3". It just ain't gonna happen. The 10-15 bhp I stated is extremely generous actually. Most systems only do 5-10 bhp over stock.
The Stage 1 may only make 20 more hp peak, but it makes a lot more everywhere else - which is why it is faster than an exhaust change alone. The very best race pipe without any boost changes will only add 20 hp.
As for Magnaflow's part, I don't know a darn thing about it. However, cats are by their very nature restrictive or they can't CATALYZE effectively. See above comments about race pipes.
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PT GT - Fastest damn lease car I could hope to have...
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