SB6 exhaust advice

[CBar]

I am finally doing something about my stock exhaust. Aftermarket exhaust is almost nonexistent, especially for my budget. My goal is to increase performance (street riding) with some added sound, but I don't want the high-pitched racket that some race-only cans produce. The stock mufflers are also very heavy. My system has already been repaired once because of this.

I have some extra Aprilia Racing titanium shotgun cans that I have been saving to make something for the SB6. The problem with the Ape cans is they are the same diameter as stock, but only at one end. The stock cans taper down, so they can fit into the tail section. To keep things relatively simple, I am coring my stock cans.

I gutted my stock cans last night. There is a lot of stuff in there! No wonder they are so heavy. I am going to use the baffles out of the Ape cans because I already have them and I can easily modify them to fit. The baffles are a straight through perforated design like the 1st picture below. I am going to match the baffle's diameter to the exhaust pipe outlet and then taper the baffle down to the smaller size of the stock muffler outlet. I am hoping the tapering will help retain some backpressure for the midrange.

Here is where I could use some advice. Would I benefit from using a different baffle design? Maybe like the 2nd picture.

Maybe someone with an aftermarket exhaust can help. Is your baffle regular perforated stainless steel? Does the size taper down from one end to the other? Do you know the size?

Thanks,
Chris

[rodericb]

taper on the inner core is either designed in to suit the tuning of the exhaust, or is just an outcome of different inlet and outlets of the muffler body. Apparantly, the best core to use is one where the hole are punched, not drilled, with the "dags" going outwards into the packing material. There's also other perforated steel core which has a perforation which sticks out into the exhaust flow but all that gas pressure will blow out glass fibre based packing fairly quickly.

A mate took the standard mufflers off his SB6R, welded perforated tube in place of the back-n-forth standard baffle array, wrapped in exhaust matting, covered it all with some Termignoni CF tubes and capped with 65mm outlets like on Rossis motogp bike. Looks trick but has a bit of a buzzing sound, like a rotary engined mazda with a racing exhaust. The SB6 has a enclosed muffler so aesthetics aren't so important but you do have to be careful with your muffler outlet selection so they'll both fit in but not heat affect that rear seat section.

[CBar]

Originally Posted by rodericb

A mate took the standard mufflers off his SB6R, welded perforated tube in place of the back-n-forth standard baffle array, wrapped in exhaust matting, covered it all with some Termignoni CF tubes and capped with 65mm outlets like on Rossis motogp bike. Looks trick but has a bit of a buzzing sound, like a rotary engined mazda with a racing exhaust. The SB6 has a enclosed muffler so aesthetics aren't so important but you do have to be careful with your muffler outlet selection so they'll both fit in but not heat affect that rear seat section.

Thanks for the reply. This is pretty much what I am doing. I wanted to use my titanium tubes, but they won't fit correctly. The stockers should work fine and I know they will fit! I am hoping that my mufflers will run cooler than stock because they will have a lot more packing in them than stock. I figure that I can always insert a baffle to quiet things down, if needed.

[djt77]

Originally Posted by rodericb

taper on the inner core is either designed in to suit the tuning of the exhaust, or is just an outcome of different inlet and outlets of the muffler body. Apparantly, the best core to use is one where the hole are punched, not drilled, with the "dags" going outwards into the packing material. There's also other perforated steel core which has a perforation which sticks out into the exhaust flow but all that gas pressure will blow out glass fibre based packing fairly quickly.

A mate took the standard mufflers off his SB6R, welded perforated tube in place of the back-n-forth standard baffle array, wrapped in exhaust matting, covered it all with some Termignoni CF tubes and capped with 65mm outlets like on Rossis motogp bike. Looks trick but has a bit of a buzzing sound, like a rotary engined mazda with a racing exhaust. The SB6 has a enclosed muffler so aesthetics aren't so important but you do have to be careful with your muffler outlet selection so they'll both fit in but not heat affect that rear seat section.

Be great to see a picture of what this looks like if you can