i agree with the OP. straight pipes does feel like you're missing some TQ on the bottom.
on top however it feels like it pulls harder than when i have my mufflers on.
running full 2.5" Fast Intentions non-res TP and non-res CBE with custom short tails to match up with the FI system. with FI tips of course
been running mine since march, with a small exception of putting the mufflers back on for inspection.
have not been on a dyno nor re-tuned. everything runs great but the butt dyno does report a slight delay/tw loss on the bottom. WOT feels great so i dont see a AFR issue.
i mean i do have my own personal uprev i guess i could fire up the laptop i test it out lol
Custom Short Tails for Fast Intentions Exhaust