exhaust downpipes yes or no ?

[solorider]

when I replaced my studs I bought mine from a Vauxhall dealer, they were nearly half the price of Yamaha ones and the same size, I bought some stainless steel dome head nuts off eBay so the water cannot get into the end of the studs again,

here is a pic of the top of my downpipes


and here is a pic of the "new" set of downpipes with the nuts,