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      06-09-2026, 08:31 PM   #3
a5m
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Drives: 2011 BMW E90 M3
Join Date: Jan 2023
Location: Chitown

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Quote:
Originally Posted by CamasM3e93 View Post
I have a catted valvetronic xpipe with a forward X that is said to experience the same issue, installed on a 6MT and a stage 2 bpm tune. I could ascertain a torque dip coming out of a stop under moderate acceleration when it first went onto the car, but it quickly disappeared. The sensation was similar to waiting on old turbos to spool. I assume that the car’s adaptations adjusted to the equipment. Car pulls linearly now.

I don’t like this particular X, however, because the cats hang down too far and I can rub on speed bumps. The car isn’t lowered much at all. I digress.
That's exactly what I'm trying to describe, like turbos waiting to spool, where you apply throttle and nothing really happens. But if this happens from 0 mph then it's a bit dangerous, like when making left turns with fast moving traffic.

I'm concerned the Akra will behave similar to a forward X, because of the 'H' crossover it has at the front. Hoping someone with one can chime in.
Appreciate 0