Last few days I have been experiencing an extreamly heavy right foot. As I have changed from 2 to 3 at full chat the car has cut out for just one or two second. Has anyone got any ideas what it could be. Its a 2.5 wrx running full de cat, dump valve, air filter and re-map.
Any advice would be great.
Thanks

 

First thing i would remove the dump valve, these are just bling bling and will in the end cause bang bang. After removal run and see how better your car feels.

 

Ha ha, like it.

 

Whats so bad about DV's?

Surely if a good one is fitted then there wont be a problem.
At the end of th day its down to personal preference whether you like a wap-toosh or not.

 

No, nothing that can harm the engine. Just that aftermarket ones - esp. some of the many VTA types - can upset the fuelling for a second, when coming off boost. Metered-for air by the ECU is being dumped away to atmos, thus too rich mixture on overun when coming off boost e.g. after a gearchange when accelerating through the gears.

If you're prepared to sacrifice potential jerky/uneven running with a VTA for the noise, then that's totally fine. Nothing wrong in that, at all.