Well guys, you can only get some much power out of 46 to 53 engine. It is not the muffler doing the work. But the reality is that the Tower 46 muffler does a good job on 46 engines, but there is an upper limit to the benefit of increase expansion area. Me thinks he is wasting is time and money by going to a yet bigger muffler for his 46 to 53 engine. He needs to step up to 61 sized engine, right?

Cheers,

Chip