i have nonseq mod, pfc, and frontmount ic. Car works fine but i have noticed slight problem with boost after mods, i have manual boost controller btw. I have set boost now at 0.8bar and it builds nicely but after about 5500rpm it starts decreasing and at redline its just about 0.5. what could cause it to not keeping boost at 0.8bars ?

 

Clogged cat.

 

Search old posts that I made on how to check for clogged cat.

 

ok ill check thanks