they made a big diference when i put them on and when put the hrc harness on made good horses on shauns dyno and was more than a tuned aprilia rs that ran half hour before which made me and shaun chuckle 
they sound good and are well made but the blue cans arnt everyones taste but when i got my nsr (10 years next week ) then got to getting parts through racing friends as i had no internet so didnt know about tyga or this site so cant compare against tyga pipes as shaun shut his dyno down and moved to ireland 
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ive seen more tarts than mr kipling