Evening all. Changed my original cat back to a tsl box and h&s deres link pipe. Found tye flanges on the cat to be rotten so luckily a mate had a nearly new cat he let me have. Changed that as well so I thought tip top. The car before boosted nicely, now its sluggish and doesn't feel like its doing anything until around 3kish. Its a my04 wrx wagon. Any help would be gratefully received guys.

Thanks

Daz

 

Any help or advice???

 

May be a remapp is required mate