I have a 08 zx-14 and im looking to do A 40-50 SHOT. Do I need springs and retainers? I'm thinking I will do them either way as I know I will eventualy want to up the shot but I am on a stock long block/and cams bike. Do I need retainers or will springs be good enough for a 60-75 shot(in the long run) Who is giveing the best bang for buck on a good set of springs. I want a good product but on a semi budget. Orient express sells a set of springs for like 160 bucks is that a good set of springs? I read a few people are useing carpenter single springs and stock retainers with no issues, but I want to hear from the n2o guys.