Well I finally got all my exhaust put together with the 3" X-pipe and 2 of the shorter dynomax bullets. I went to the dyno yesterday right after I got out of the muffler shop and here's what I saw! The red graph is before with all the mods in my sig except the exhaust. I had stock manifolds, stock y, cats, and hooker catback. More than I expected. This is with ZERO tuning.

 

You picked up all that with the headers and duals? Damn.

 

40 hp and almost as much torque!

Nice!

 

Awesome! I can't wait to get my pacesetters and duals on!

 

Thats Impresive!!!

 

The reason you picked up so much power is because the 98-00 ls1's had more restricted exhaust manifolds on them than the 01-02 ls1's. 98-00 ls1's always pick up more power with Lt's than the 01-02 ls1's.

 

Not only that but you need to look at the AF change.. Before it was starting at 13.5-1 and from 5k+ it was at 15-1. The headers fixed that problem.. Great gains though..

 

Holy geeebus, I can't wait to get my car to the dyno and see what it does now.
-Steve

 

Damn nice numbers

 

how did those pacesetters fit? i heard they dont bolt on real easy. im in the market for headers myself and i am considering pacestetter's, but some people are talking me out of them, what do you think about them. i see the gain is good, great numbers

 

Wow great gains, but I think the LS6 cam you have in there might be breathing better now because of the headers. I think that is why you saw such large gains.

 

I just put my pacesetter headers on and it really wasn't that hard. I removed both coil packs to make it easier to get to the bolts and had to jack up the driver side of the motor but didn't have to remove the motor mount bolts all of the way they were only $330 for ceramic coated. I think the are well worth the money and I hope I can gain around 30 hp with them and GMMG exhaust

 

That's a great gain but very misleading on an actual header gain.The before was way too lean indicating timing was being pulled by knock.If your before had A/F at 13-1 It would gain 20hp and alot of torque.
Either way,congrat's.I'm sure the car pulls nice now.

 

Nice gains!

Do you have a SAE version of this dyno graph?

 

exactly.

 

yeah, i snapped my aluminum driveshaft last night grabbing 2nd. I was having a really good day until that. I dont know why that happened, but I got a new one, and ill be back on the road in a couple days. My car pulls nice and hard now. If I'm mean to it, I wont start hookin up til 4th gear on Eagle F1's. It's fun.

 

pacesetters arent hard at all, perfect IMO no real issues here, besides the normal problems

 

OOhhh!!!nice...

I love to see pics of your setup installed!
How bad is the noise of the dynomax bullet into the car?

Happy Hollidays.

 

The sound inside the car isnt as bad as I expected it to be. Instead of having the tips turned straight down, I had them turned out at a 45 degree angle to the ground so its not so bad.