OK escalade made 565/573 no issues to 6k rpms.
Added meth and when using meth got 598 ft lbs of tq but at 5200 to 5300 it just closes the tb. Truck made 580 rwhp when tb closed so im sure another 800 rpms would be around 615 rwhp. It's making more power overall.
Did few passes no other issues just at that same rpm tb just closes.
Turned off meth and put in premeth tune and no problems truck went up to 6k rpms no issues.
16 escalade
Whipple 2.9
7.5 psi boost
Long tubes
3.5 cat back
No other mods except meth
Anyone have any ideas?