You can weld stainless and mild no problem... I've done it a couple times and once i done it iflipped the car 3 times through a hedge and it was still on there strong lol I'll grab a link for you now gimme 2 secs 
Linky: http://www.ebay.co.uk/itm/Jetex-Universa...3f1fcc1c72
Thats best for the job because its a tight turn to get your exhaust down the tunnel nicely

Linky: http://www.ebay.co.uk/itm/Jetex-Universa...3f1fcc1c72
Thats best for the job because its a tight turn to get your exhaust down the tunnel nicely

Doesnt even own a 306.