Originally posted by FormerCA.
I read in the article on their website that since the Saito exhaust comes out towards the rear, that the author had to notch and box the firewall-kinda makes me want to go with a YS140, since they exit on side.
There is another thread on here somewhere with pictures of how somebody else has done this. Yes you do have to remove around 1/4" off the bottom of the firewall in one place to allow the muffler to exit.
The other engine that intersts me is the new YS 140 Sport.