Does anyone know of any good pipes that have a high flow cat in only the front midpipe section and not the downpipe section? I am looking for the extended pipe, not the shorty downpipe.
That's how most of them are set up. This is because placing the cat in the rear most section mean less restriction mean better gains.
The Helix downpipe has the high flow in the downpipe section. I am just looking for one in the midpipe section. Or does it not matter? Has anybody used the billy boat exhaust with the high flow? http://www.horsepowerfreaks.com/price/Subaru/WRX/Billy_Boat/Exhaust/Downpipes. From the picture it looks like the single pipe for both the down and midpipes with the cat in the midpipe section.
I have the Helix catted downpipe with the B&B catback. Whole setup is 3". Made 305whp / 340wtq. Going to TopSpeed Wednesday to get hooked up with meth injection.
and Brian has the B&B downpipe with the HKS catback, which if I remember correctly you have too clemsonscooby