i had my hotair catch fire once. problem was the up-pipe has a leak which caused the sagging hood liner to catch on fire. it burnt alot but i got it all fixed. IMO if your hoodliner is in good shape and you have the proper heat shield in place it wont effect anything. If your worried get the bigger heat shield from buickgn.com and put some heat resistant sheets behind that. thats how i have fine and its always super cool under there.