[Go Galfer]

Thanks for posting your thoughts guys.

I have the 998R cams in the garage and wanted to see if anyone had done the 45/54mm pipe on the 998?

Short of someone having done that I guess the answer can be obtained via a Dyno test with each pipe. I had a 45/50 half system on the bike when I bought it and got a smoking deal from Martin Brickwoods shop in Canada for the Sil Moto 45/54 half system - so it won't be that expensive to test.