I have a HKS downpipe on my 05 STI, and get absolutely no creep at all. Im running the Utec stage 2 map, spikes to about 18psi, settles to 16 psi, then fades off till redline . Nothing the Superzilla, external wastegate, injectors and frontmount i ordered wont fix though
Im pretty happy with the Utec Stage 2 and my HKS downpipe, went 12.9 @107 on crappy snow tires spinning bad. Most importantly it has no creep, even on highway pulls in 5th and 6th gear.
Oh yea, did u end up beating that S2k last night? It looked pretty quick from what i saw.