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I'm sure this topic has been abused but...I have read that the FMF FACTORY 4.1 RCT Slip On improves the low and mid performance. Does it rob the top end at all to do this? Has anyone that has installed experienced any loss in their top end? Does it still pull as long in 5th?

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7 hours ago, Yama11 said:

I'm sure this topic has been abused but...I have read that the FMF FACTORY 4.1 RCT Slip On improves the low and mid performance. Does it rob the top end at all to do this? Has anyone that has installed experienced any loss in their top end? Does it still pull as long in 5th?

I'm not sure why one straight through slip on from another would make much difference in power. It may help a little as it's straight through. 

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