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Old 04-29-2014, 01:43 PM   #1757
Doesn't Care
ph0rk's Avatar
Joined: Dec 2009
Location: Oaktown
Oddometer: 2,302
Originally Posted by Rapid Dog View Post
Just the opposite, smoother running meaning less jerkiness and more refined/controlled operation with both the throttle and the gearbox/clutch.
This doesn't mean a loss of torque.

2 of the best mods for a modern boxer are the cat removal and a fuel nanny or Accelerator (booster plug) module.
I don't see how removing the cat won't also reduce backpressure, especially at lower revs - perhaps the flapper valve can provide enough? I find it unlikely that you'll markedly improve performance at one end of the rev range without altering it elsewhere. Maybe the motor is just that restricted - but if you're optimizing engine air flow at one rate, it can't remain optimized at the lower rate, too, can it?

I wouldn't do any more than a slip on, and then only for sound - Illegal in my current state anyway, but do the premade cat removal systems include provisions for keeping the flapper valve?

(IMHO, the flapper serves two functions - readability and less obnoxious sound at low revs/around town).

Also, regarding performance, how in the hell is a 2011+ R12 not quick enough for legal speeds?

Then again, maybe the R12 has enough whoopass that losing some low end won't matter - I almost never go WOT as it is.
--Semantics are everything.
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