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lol the good old day, i did this on my old rover 214. sounded nice but thats it, oh and i only did 15mm instead of tennis ball size
 
Id imagine that the guy selling this has just upgraded to a K&N universal induction filter and spent the fiver shange on a custom stainless steel back box. lol.
 
It amazes me that somebody, somewhere, is going to think that is a good idea and will actually pay money for it.

Only on eBay.....
 
I wander if hes gonna discount the postage because the weight saving hes made to the item?
 
Infact! Thats it, you gain the extra performance from the reduced weight! Thats what weve all been doing wrong! Im gonna get the drill!:doh: A couple big holes in the rocker cver should ditch a few pounds!