TBR claims it doesn't drop HP
I have the TBR black series, and that quote depends on WHICH dB killer you're talking about
. I have both, and the P1X (the quieter of the 2) definitely chokes the engine on this big motor with just one can. TBR sent me the P1 free of charge, and the difference was noticeable. The P1X inner circumference (inside the can) is noticeably smaller than stock. The can uncorked probably gains a few HP on top, but suffers down low and mid rpm. The motor feels the best with the P1, which is only marginally larger than stock, so retains the low to mid rpm torque without being restrictive up top. And the noise level is absolutely perfect for my taste: deep and healthy, and just as loud as the engine itself, so perfect for my taste. But as most of us already know, any power gain (if any) is minimal. I just wanted the stock abomination out, without losing power over stock... which is exactly what happened with the P1X. Now all is well with the P1, at stock power levels low and mid, and maybe a hair more on top, but with a much nicer looking can and 9 lbs less.
Considered Steve's tune, but when I PMed him if he could do it without touching engine braking (and other concerns) and no response, left it alone. And I'm glad, because with the P1 insert, I'm okay with its performance now (probably same or very similar to stock can). It has less power than my ex BMW sport bike, but like the throttle response, engine braking, etc. No sense in risking my warranty for a little bit more performance when I like everything else, but to each his own. And will spend that money in gear
. Enjoy your weekend everybody.