Hi all

just a quick question, i have just had fitted a 3" turbo back system with a centre section with resinator pipe and a cobra back box with a 4" slash cut

now it seems i have lost a bit of performance it doesnt seem to be as quick as before when the standard ( stock ) system was fitted


on my last 2 WRX cars i have had 2.5" turbo back systems without any problems.

Could any one shed an light on this please

 

i think a remap would be needed if you go straight through with 3" you only really need to go 3" if you have higher bhp ie 320+

 

Did you change the gaskets? The turbo-downpipe gasket could be blowing, I dont know if that could cause loss of performance?

 

+1 for the above ,just because you go from a 2.5 inch system to a 3 inch system does not guarantee you will see more power. .Most mappers will tell you that a decent 2.5 ' inch system is more than adequate unless your thinking about serious power or a stage 3 remap.

 

ok thanks for the info, i still think there is a problem with the system somewhere i will check all the joints ect and see how it goes

thanks

 

if youve gone from a catted system to de-cat which i read you have then its possible its boost spiking then cutting it for safety. a re-map is in order on most new age cars when de-catting as the ecu can be very sensitive

 

Hi cheers for the responce, but i have had 2 other bugeyes running 2.5" turbo back systems ( no cat ) with uprated fuel pump and K&N panel filter with no problems at all

the only thing thats differant on this one is the stock fuel pump & 3" system

 

you may well have, but different cars do behave in different ways. Even same year and models. In my own experience with fitting a de-cat albeit to an sti a re-map was a must as i was seeing boost spiking of between 22 & 25 psi then the ecu pulled it. could visable see it on a boost guage.

 

well im going to stick a fuel pump in as well then i will take it from there. thanks for the info m8