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I have a standard 2006 Hawkeye STI Type UK and just getting together parts for a Bob Rawle stage 1 mAP.
on order is an RCM fuel pump and Scorpion Red Power back box and de-cat centre section.
Can someone please suggest a suitable Sports cat down pipe that is 3" but narrows to 2.5" to meet the scorpion exhaust system. Seen a couple on ebay but want a good quality item.
Also, which is the better panel filter to go for, K&N or Cosworth?
My advice would be to speak to Bob, especially as he will be mapping it.
This^^^
And when he maps it, take your shoes off and drive in your socks. Makes it much easier to feather the thottle and keep the car steady at a set boost level.