R90 /6 2 into 1 exhaust

[dchiesahome]

Will an R80 GS/ST exhaust header fit an R90 /6? Looking to go to a 2 into 1 setup.

 

[stevenrankin]

No, completely different series of bikes. Look for a system at Mac or somewhere aftermarket. St.

 

[6322]

Actually, I’ve installed an R80ST exhaust system on my ‘77 R100/7, and can’t see a reason it couldn’t be adapted to the R90/6. I did change the angle of the exit from the collector, and added a Super Trap. This worked well for my dirt hack, moving the exhaust exit to the opposite side of the bike from the sidecar.

 

[dchiesahome]

That looks good. I would change the muffler to a high mount with a connector pipe but the header looks like it fits well

 

[6322]

After the factory muffler leaves the collector, it angles up. With a factory R90/6 rear frame, it would not clear. The R80ST rear frame is modified so there’s no interference.