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100% stock it put down 373rwhp and 367rwtq. With a haltech killerbee mf 103 and Texas speed 1 7/8 longtubes and catless xpipe and a tune it put down 434rwhp and 440rwtq. This is my first ls car and I'm blown away by how the respond to mods!
You could pick up another 5 HP by swapping out the factory NPP exhaust/mufflers for aftermarket ones. The factory system is 3.0" back to where the exhaust pipe enters the mufflers, then it drops down to 2.5 then back to 3.0". That little 2.5 section cost 5HP believe it or not. All the aftermarket NPP mufflers or 3.0" all the way.
I swapped out Factory NPP exhaust for Billy Boat system, I purchased off Corvette Forum back in 2011 for $650.00 on below car.
For this one I'll be using 2016 Electrical NPP exhaust. Will be trying to run in 10's with 400-430 RWHP.
PS: In case your wondering what the Hell, I'm 75 yr's old an I do this for fun of trying to do what ya'll do with HP to Weight, by trying to do Weight to HP to achieve the same end....LOL
Last edited by poorhousenext; 03-07-2019 at 02:10 PM.
Npp muffs are pretty good. We made 576whp through them last weekend with lazer's c6 h/c ls3.
we've even had it open x vs npp and it seems to be the same when he was bolt ons. I thought that was strange but we didn't get a chance to finish the test due to a retainer failure.
if you think a ls responds to bolt ons well you should look at getting a light clutch for it.
There's about 35 more whp in bolt ons left there to if you want to go after them.
I've got an ati balancer 10% ud that I have not had a chance to install also. Not gonna worry about the clutch until it's time to change it tho. Not sure what mod I'll get next tho.
03-07-2019, 08:00 AM
2013 Corvette grandsport m6 dyno results 
