Bringing this back from the dead - I know, I know... Just wanted to clarify (as some of the later posts are querying), bypassing the N249 won't affect emissions. BaV was talking about removing the secondary air pump, which is used to bring the catalytic converter up to temperature when cold starting. Removing this pump won't do much for performance (probably nothing actually) but will tidy up the engine bay at the same time as affecting emissions. If you remove it, make sure you put it back on before getting your car MOT'd On a side note - I'm thinking of bypassing the N249 on my AUM to see what all the fuss is about - I assume this kind of "modification" needs to be declared to the insurance company? Before anyone starts having a go, I'm not the sort of person that wants to hide anything from them in order to save myself a few quid, I am genuinely unsure as to whether this would need to be declared. After all, it's bypassing something that already exists, not adding something fancy/expensive. Cheers.
I've not got a Dump Valve fitted to mine where would the pipe go instead?
So, I've recently bought a gti 180 and was just wondering if a few years down the line you still swear by this mod being the way to go?Thanks