Dyno testing on Inliners a few years ago showed that of the 3 brands available, the PES brand consistently showed the highest gain, while the Hi-Flow brand made by Tom Lowe was the next best choice., Both the PES and Hi-Flow are made by Tom Lowe.
I would suggest you go to Inliners International devoted to all Inline powered vehicles and ask this question. I have my work done by Mike Kirby at Sissell's in West Covina but I have a 292 and this made a huge improvement with the performance Injected 292. When you get into the Inliners site there is a Tech section. Try that.