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I think the tri-y design is well worth the wait. The headers Pfadt is coming out with lately are very impressive. I know I will be going with them. I have almost all of Pfadts lineup and have never had such quality pieces on any build. Engine/tranny mounts, coilovers, heavy rate sways, polly control arm bushings, and even the rear tow hook . I will be more than happy to add their headers to my setup!
Also installed 1 & 7/8" ARH with 3" off-road x-pipe on our '04 auto coupe. Did a cam and valve spring install at the same time so the plugs, wires, dipstick ... were already out. Driver's side went in no problem. Simple, in seconds. Had to remove the starter on the passenger side but it wasn't a big deal. On ours we had to put the header "half way up" and reinstall the starter then finish putting the header up. Once the header is on you'll never have access to the starter. It wasn't a big deal.
Also, the dipstick tube on ours went right back in using the stock bracket and bolt. Zero issues.
This is the only set of C5 headers I've ever purchased and I would buy another set in a heartbeat. You can tell it's a very high quality product and Anthony's customer service is second to none!
We installed my 17/8 and 3 in X ARH during a head and cam install, I didnt remove anything extra, I didnt need to remove the starter. They only hangup was the o2 wiring had to get that out of the way to slip the drivers side in.
In light of what Tar Heel just mentioned, I recommend anyone doing headers to take the time to put a starter blanket on while in there. With headers running as hot as they do, the starter will see more heat, and being that it will now be harder to get to, you should take the extra measure to ensure the life of it.
Im going to put this on my list for when I do a set. I dont know if Id call it insurance, but if it can help, I think its well worth it.
Thanks Bluefire, but could you expand on "easy as pie"? Did either the alternator or starter have to be removed? Did you have access to a lift? Etc.
Personally, and I know people have done it on stands just fine, I wouldn't do a header install without access to a lift on a C5, at least if you're trying to get it done in a day or two. Probably easily a six hour job, most of it on your back, for the average garage warrior.
So much easier to get things in correctly without straining yourself and get the little things done properly on a lift (o2 sensor routing for instance).
Without lift access, the ~$300 to a quality shop to install it on a lift is probably money well spent.