i was going to do some tune up stuff to my 02 f4i soon. i want to replace the spark plugs but i want to make sure i get the most performance out of them. which spark is the best? also i was wondering about a ignition advancer as well for my bike. will a factory pro one give me any help in the performance area. ive already done a ton of stuff to my bike so this is a bit more. The last thing is that ive read about velocity stacks and i understand what they do. im having a hard time finding some for my bike. does anyone know where to get stacks for an 02 f4i?

 

don't worry about the mechanical ignition advance, get the dynojet ignition module instead. it's a little more expensive but it will give you more flexability for tuning. as for sparks.. check this link out.

http://cgi.ebay.com/ebaymotors/ws/eB...:IT&ih=018

that's a ~$30 plug from a dealer.