Help put exhaust on now Over Boostin!!!!!

[macdaddyvu]

Hey Fellow DSMERS

I have a 95 gst with the evo 16g,adjustable FPR, front mount,walbro 255 fuel pump,intake,
boost controller,NO Safc Or Afc,but i just put on My 3Inch Exhaust turbo back,downpipe is 2.5 then flares to 3in,no cat then 3inch the rest of the way back,i had my boost controller set at 20psi,but until i put the exhaust on i cant make it stay under 20 it goes past 20,
it was working fine until i put it on can some one help me!!!

 

[macdaddyvu]

Update!!! got it fixed, i just orderd the o2 external wastgate from punishment racing, works awsome thought i would let you all know. thanks for all the help guys

 

[airmail96]

Glad to see you got it fixed I was just about to suggest to you to add a catalytic converter.