New here and looking for information. Has anyone used a Yosh 4/1 full exhaust system on a ZX14R and has before and after dyno results. Looked at both Yosh and Akra 4/1 systems and the Yosh is nearly 1/2 the price. Thats a lot of difference. Ivan says he has dyno numbers but could not find results on his site for the Yosh (Just the Akra and Brocks)