LS3 6.2 Corvette owners installing LS7 exhaust manifolds/cats are getting 15+ hp/tq gains with this relatively low cost mood and staying emissions compliant. Not sure if gains would be the same on our trucks but Corvette owners claim the setup is superior to installing shorty headers on their factory LS3 exhaust. Looking at the manifolds the tubing takes a pretty sharp 90* turn to the rear but not sure if it would be enough for clearance on our trucks. Has anyone tried this? If so what was your results?
Thanks In Advance if Anyone Has Some Information to Share.

 

We installed them on a 6.0L LS3 head truck build. Have no before/after to compare too but they seem to be working well.

 

Any clearance issues?

 

Thats exactly why they were chosen. Closest thing to block huggers we could find. Its still pretty tight where they drop, but nothing rubs/hits.

 

They look like they would clear nicely, thanks for the confirmation.

 

We used them on that 87 swap above btw, not a gmt900, just wanted to mention as I cant attest to fitment on an 07+

 

Understood....