View Full Version : Scion xB disc #

11-13-2008, 01:40 PM
Hi All,

Well a teenage gearhead of the early 80's has embraced the Supertrapp muffler again and instead of it being on a fire breathing small block this time it is on an 06 Scion xB with a stock 1.5L,4cyl (stock except for a header), 2-1/4" exhaust and my now newly installed 4" disc 18" long Supertrapp muffler. What number of discs would you suggest for best backpressure on this engine?

Thanks so much and it is good to be back,

Charles :)

11-14-2008, 07:35 AM
Welcome back! 6-8 discs should be provide enough flow on your liter & a half; however if you find top end suffering add a couple of discs until recovered. The FI should compensate for whatever you throw at it as long as you have a little back pressure.