yeah how long is a piece of string ? ball park figure ?? bought a 95 1200 S sportster, i dont know of any engine work already done. it has following: screaming eagle carby, ign module, open drag pipes -i measured 1"3/4 Dia out of head for around (lenght) 2" 1/2 and goes to 2"3/8 Dia. run 98 ron fuel I have to do the fork seals, i dont know the amount required to refill to standard? I reckon i need to make up baffle to increase back pressure for more grunt? I'll use a bolt through pipe with washer welded to top of nut on inside, I only get around 100 miles to the tank at 70 mph, is this right? what bigger tank do you suggest that will fit on easyest (is that a word?) I have to ride this thing everyday rain/hail/ shine as only transport. the nearest Harley dealer is about 350 miles away, so as you can see i live in the bush and the only help is self help or if its to sick you have to shoot it.... i checked out S&S 100 to suit which is about $8053. aust landed, includes carby/g box thanks for any help.