i dont know about 1.7's but i have 1.8's on my vs and they make a decent improvement. when i first put them on i only had the exhaust done and a pod filter (alot more than that done now, lol) and one of the biggest performance improvements i noticed was the ease at which it could build up rev's quickly after fitting them. they probably arent the best "bang for your buck" mod (they are quite pricey for what you get from them) but they do make an noticable improvement.
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