Out of interest, is your car mapped?
Good point. No, it's not. On a remapped ED30 pre cat removal may be a different thing.
On a K03 GTI I guess not. Keep in mind the Cupra R, Mk.VI Golf R, Audi S3 and TT-S also
have the same pre cat and they are reliable with ~ 270 BHP.
Wow? That's something totally different compared to other reviews?! Others are 100% positive. Dyno's give around 5bhp extra, etc etc...
Yes, I know. For many years now I read the positive reviews on the web and these made
me to remove the pre cat. To be honest I think it's neccessary to tell the whole story.
I don't doubt the 5 bhp increase on the dyno. But you won't feel this difference when
sitting in the car. So there are some very slight performance advantages. On the other
hand there are some downsides which I don't like: one hour of labour, a stinking car and
(to my ears) a less beautiful sound (slightly more drone).