Just got finished installing my ACE 350 headers!! Still waiting on base tune from CSG/Delicous they said by the weekend.
Took a spin with my OFT V4.03 tune but didn't go full throttle. Intial thoughts are great you can tell the torque dip is gone just as good or better then the Gruppe-s uel headers.
Also I prefer the tone of EL header its sounds much cleaner and refined and maybe a bit quieter then the UEL. Sounds great with my Invidia CFP, HKS Legamax. Although I may change as I want 2.5" piping all the way throught to match the output of the ACE.
Any of the Japanese exhausts are going to be 2.36". Considering Hooker Blacker Catted with Helmholtz chamber FP, and their dual catback (7lbs lighter than stock). Or Borla Catback (10lbs lighter than stock)
Comparison picture. All bolts anti-seized, all connection surfaces lightly coated with acoustic-seal, ready to install
scraped all surfaces of old gasket
Forgot to take pics after it was all bolted up
Did have to take off a 14mm for the passenger side motor mount and jacked an inch with a board under the oilpan.
I also installed the Overpipe first which blocks access to one of the header bolts with a socket. I was able to reach around with a wrench to get to it. Overall painless install.
Can't wait for my tune!!!