No need to thank me lah.we come to this forum to share knowledge
right?i,myself still learning too. 
Autodesigns is selling at $148.No sure if it include installation
fee.U can call them @ 65665912.
Dun worry,i not salesman or work for them k?i changed my Spitfire
sparkplugs there @ $68.Got $10 discount.Of course,tat time i go
down to change in groups.4 of us...I think their service not
bad.
Not like Autobac,they very suck up!