There was significant work done on the engine but it was delivered choked out big time only so it could pass Euro 5...Suzuki will leave it up to the end user to perfect it's performance..I wish they would have compared apples-to-apples instead of a Gen-1 with full exhaust, tune, unrestricted, etc. The weight difference alone is what they describe on the roadcourse.
The Dyno testing is interesting though and shocked about the air filter gains.
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Like going to a restaurant buffet, you decide what you want