I never said it wouldn't work, but it's far easier, cheaper, and more reliable to use a b pipe. Some of the TPE 964s with b pipes have been "a little much" for some customers in the surf, thus proving b pipes can work pretty well, and are far simpler.
That said, a b pipe was designed around a 633 engine. It's limited in size/volume. When going to a big motor (1000+CCs), you won't make the power it's capable of with a b pipe. The PFP and RRP pipes really shine with the big motors. If you're building an 1100, you should consider using the PFP, or know your 1100 with a b pipe will run like a much smaller engine, because the pipe limits your exhaust flow. Am I saying a b piped 1100 won't run any better than a b piped 900? No, but it won't run to its potential. The larger the engine, the more of s handicap the b pipe is.
As a general rule, 701s don't need PFPs, but most engines of 1000-1100 CCs do.
Hope that helps. Most tuners/builders can make your package work, if you've followed their guidelines.
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