Finally getting my ZR-1 back from Corey's!!!

[-=Jeff=-]

Originally Posted by xlr8nflorida

I have a good amount of HP. I don't think you are leaving anywhere near 20 hp on the table especially at the 360hp level. Yes, the Borla restricts as the resonator. However, it sounds good if you like fairly quiet and no resonance. I hate resonance.

The most you are leaving on the table is 5-10 hp on account of the resonator. You can modify your existing reasonator or get an LT-4 resonator. The X pipe will make resonance.

Headers definetly give you 20hp and with a good exhaust you are golden.

To me anyway, unless its 20HP increase or more, the seat of the pants dyno is not affected.

I understand maximizing HP especially cheap hp. Just keep in mind there are trade offs.

I think you can gain 20hp by switching from Borla to B&B which is a bigger less restrictive system and also much louder with more rumble.

The exhaust claims I think are overstated. When the Borla came out in 1990, I have an ad that came from a reputable shop in Florida, I think it was in corvette fever, it says 40 HP increase from exhaust over stock - I'm sorry no way do I believe it. I think half the time you have to cut the claims in half in most people's applications.

Which Borla do you have? I found with my Borla Challenge system I was getting resonance, granted not anything near like B&B but it was there and it was annoying. It was mostly noticeable in the normal range 1500-2000rpm, but with the windows up and AC on.

B&B is louder, magnaflow has more drone then my borla does.

the Corsa has none or next to none with headers. Each person has a different tolerable level for resonance, some more then others

So far I like my Corsa, it is louder then borla the resonance is almost not there