Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - XFORCE Unequalled-length header for Toyota 86

86MLR · 09-21-2018, 07:36 AM

The primaries are smaller than OEM, but this new X Force one is 4:1, unlike OEM 4:2:1.

The removal of the cat is a plus.

4:1 is better up top

4:2:1 apparently has better midrange.

Same for primary size, smaller is better down low, bigger up top.

Same same for secondaries

Same same for length to pipes

Oh, and collector design.

I don't know and cannot find any info on the X Force IRT R&D.

They are cheap, website says $599 though.

So, in summing up, the only power gain is most likely from removing the cat.

I may be over thinking this, I'm a few Whiskeys down.

09-21-2018, 07:36 AM	#7
86MLR Senior Member Join Date: Aug 2018 Drives: 2002 VX Commodore SS LS1 Auto Location: Sydney Posts: 2,203 Thanks: 500 Thanked 2,185 Times in 1,111 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	The primaries are smaller than OEM, but this new X Force one is 4:1, unlike OEM 4:2:1. The removal of the cat is a plus. 4:1 is better up top 4:2:1 apparently has better midrange. Same for primary size, smaller is better down low, bigger up top. Same same for secondaries Same same for length to pipes Oh, and collector design. I don't know and cannot find any info on the X Force IRT R&D. They are cheap, website says $599 though. So, in summing up, the only power gain is most likely from removing the cat. I may be over thinking this, I'm a few Whiskeys down.