Hose clamps work very well. Be sure to keep pulling the wrap tight as you wind it on. If there is a longer section that's difficult to put a clamp on then twist some mechanics wire at that spot. Done correctly there won't be any unraveling. I think there is an additional benefit to wrapping the headers on the Camaro which is dampening sounds that might be mis-interpreted as knock by the computer. Good Luck.

 

The wrap can catch fire if it gets oil soaked as mentioned, so be very careful where you wrap them. Yes, it will help alot with heat under hood. My 3" downpipe on my GN has been wrapped for over 10 years, I periodically do have to rewrap it as it does touch the frame ever so slightly when the engine torques over a little, but the pipe is still nice a clean. You can touch the downpipe after a 25# blast down the 1/4 and its just warm to the touch, so it keeps alot of heat out of the engine bay... But again, nake sure it can't get oil on it!
On my TA, they are wrapped only on the 2 tubes going down the passenger side that are close to the ABS and O2 wires going down there.

I always use steel hose clamps, no probs.

If doing a whole set of headers, I wouldn't wrap more than about 6-8" on each promary..maybe half way down..thats where most of the heat is coming from. I've got a hood now that extract alot of the heat and what air doesn't go into the ram air goes into the engine compartment to help cool it down.

 

We always recommend coating over wrap. The coating will keep your headers looking great, plus reduce underhood temps. Wrap on the other hand just ruins the headers finish.

 

What about stainless headers?

 

Wrap the headers at least to and including the collector. It's not just about keeping underhood temperatures down. The important reason is to keep the exhaust temp up and therefore the exhaust gas velocity as high as possible for the best cylinder scavenging.

 

They will still require some sort of thermal coating if you are wanting to reduce underhood temps and improve exhaust scavenging.

 

Stainless headers need to be coated for heat reduction. Your stock cast iron manifold are great heat insulators, and keep heat out the engine bay. Steel, and especially stainless steel headers are much thinner, so your underhood temps will actually go up with uncoated headers.

The coatings out there now are pretty high tech formula's, and will last the life of the header while greatly reducing underhood temps (as long as you buy from a reputable company). Just last weekend me and my wife took our GTO to visit my inlaws two hours away. We have Precision Motorsports of Florida's cherry red coating on Kooks stainless headers. About 10 minutes after we got there, I bought my father in law out to show him the headers and coating. In just that 10 minutes the headers had cooled enough that I could put my hand on them. They were hot...but not more so than say hot tap water.