Hey Guys,

Made another trip to the dragway on friday night. I loaded a Wheatley Tune into a buddy's 2010 Sierra Denali who has a "custom" cat back and a K&N CAI. The cat back isnt worth anything but noise. He ran a best of 13.843 @ 99.85 MPH. He was running on steel 17" caddy shipping wheels, but other than that it was untouched. Hows that for IMPRESSIVE! The DA was about -300, so nothing drastic at all. With headers and a little more weather on our side this thing will see 13.5's with ease. Damn I wish I had a 6 speed...

2010 Sierra Denali tune only 13.84 1/4 mile - YouTube

Hows that for a rolling Wheatley billboard!

 

great time but why is the catback not worth anything?

 

It's a custom dual cat back with a flowmaster muffler and pipes that aren't mandrel bent. I would put money down that it made almost no improvemt over stock. Even people with nice bolt on 3.5" mandrel kits don't gain much over the stock 6.2 exhaust. It is loud as all hell though... Crazy the difference between this truck with a 40 series and my old Vortec 350.

 

That's awesome

 

X2 that is sweet , little mods = another GM factory hot rod !

 

It's a very impressive ride Tim.

Hard to beat it as a daily driver in my opinion. I know someone selling a tvs1900 for a 6.2 also... Just saying haha

 

Just another notch in the ls cap!

 

Yup its an awesome truck. I had been trying to convince him to get headers for a while, but he wouldn't budge. I would be pretty happy with a 13.5 in a daily driver like that... especially with absolutely no sacrifices in drivability, because lets face it, even a small cam has its negatives. Sure its got its positives, and I think its worth it, but sometimes I wish my truck still ran smooth as silk.

 

What did it run before the tune?

 

I know with just the intake he managed a 14.99, but the conditions werent as good on that day.