YRRD exhaust for std bore ?

I've a chance to buy YRRD(Rinaldi) exhaust for my yz125 2005 in good price. I know that this pipe is specially tuned for whole 144cc kit but will it work with my stock cylinder or just gonna make it weaker compare to stock pipe? 

Porting and head work with good girl and jetting will do much more than any pipe you throw at it.

It depends more on the port timing than it does bore. Most 125 pipes work very well with the 144 kits, so I'd assume the opposite to be the same. If the price is good, try it. If you don't like it, sell it or have your engine bored.

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