I've been searching around for an appropriately sized test pipe to use with the HKS downpipe and an HKS carbon Ti. Does anyone make a good test pipe to use with these two?

 

I have the same combo and i'd like to know as well..........also the best highflow cat that mates up with no modifications to it???

 

A testpipe is just a pipe. It doesn't matter. Just make sure it fits to your system and has an o2 sensor bung. I think Helix/Buschur/Ultimate-Racing/WORKS all make them like that.

 

well sizing was my concern, as far as using a 3 inch or a 2.5 inch. Is a 2.5 inch too small or a 3 inch too big. the hks downpipe ends as 2.65 right, no consensus as far as what the size actually is?

 

UR 3" that's what I have.

 

bump for some more replies... I have a 3" UR test pipe, but didn't install it between my HKS dp and HKS catback yet. I was concerned with sealing issues at the flanges. I also wasn't sure whether to use a 2.5 or 3" gasket. 3 looks too big, but 2.5 might be a restriction. What did you guys use with the HKS dp and cb?

 

I have the exact same set-up and use the Perrin test pipe with the O2 simulator. I have heard the UR test pipe is a nice set-up also.

 

I use the Random Technology Hi-Flow Cat (the one that fits the stock diameter exhaust) that fits nicely with the HKS downpipe. I have a Borla Exhaust on the other side, so I think it would fit with your HKS exhaust as well.

BRent

 

2.5" test pipe unless you get the tapered end of the midpipe we-welded to make it a full 3"

I have 1 for sale brand new if you want one

 

My Helix 3" high flow cat bolt up to my 2.75" tanabe dp and HKS hiper without any issue.

Tom

 

+1 for the same setup, but I have a Helix 3" test pipe on an MR with no fitment issues.

 

thanks for the responses guys

 

I have a 2.5in testpipe on my hks dp and hks hi power exhaust. It fits perfect with no issues. I have used a 3 in test pipe and a 3in hi flow cat also with only small problems with fitting. Nothing gaskets and sealer could not help fix. But I like the fitment of the 2.5in testpipe better. I don't see there being much power difference from using either a 2.5in or 3in testpipe.

 

either the 3 inch or 2.5 Ultimate Racing one will fit and work great - the holes are slotted on the them to allow fitment to a variety of downpipes and catbacks