That's interesting as always have this feeling that your only porting a inch down so your still with a restrictor, it's like having a 3 inch down pipe down to a 2.5 it still isn't free flowing just moving the limit further down ,
But if you say you felt an improvement then blows my theiry out,
Some aftermarket headers and up pipes don't work as to large and flood non large blowers,
I found the rcm worked very well on A vf35
I'm still unsure if I want to do that stuff to my ra as don't want to modify it other than fitting Sti parts
Would love these and the ti cat back that's for sale on here and get a ti down pipe to match
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