Ludedude

Are you sure about those numbers? I thought that 3db was a doubling in power, so 15 db would be much more than 4 times louder.

JonBoy

I thought it was 6db to double the sound, but I looked it up and you are correct. 3db will double the sound.

That said, 10db is considered to subjectively double the sound - I went between the two, I guess (unintentionally, mind you).

Ludedude

That sounds right, thanks for confirming that. In any case, 110 db is LOUD

JonBoy

Yup - permanent hearing damage in under five minutes for sure (unprotected). Might be loud enough to do permanent damage in two minutes...

jsalicru

The way that I got the car to stay happy is to make it think that the cat was a super duper one.. I left the second O2 sensor hooked but reading fresh air.

BlueS2000Boy

when i was installing my J's racing exhaust we started the car up with no exhaust and it was loud. sounded nice though. although when i gave it gas the car didn't seem like it would have ran well.

AOK

Another think to consider is the carbon monoxide gas will be exiting right underneath the car which might not be a good thing in traffic with just the header on might be ok with the cat but would not want to take health risk for a few more Hp gain JMO.

3ngin33r1

Cannonbear

a 14.3 in a GTS with just an oepn exhaust???

Hmm, i know one guy hits high 13's with stripped interior and bolt ons (w/ lsd). My gts was pretty built as well and the lowest i hit was 14.5 (w/ interior). What mods did you have?

S2k426

How did that happen (picture), was the exhaust still on, or up against the car, was the exhaust off please explain!! That picture scares me!