340 headers?
Sorry to break it to you but nothing fits anywhere close to TTI's. I was skeptical at first also but after installing both Hedmans and Hookers and both taking a days very hard work (with some help) and seeing a buddy of mine put on a set of TTI's (by himself) in just 3 hrs. I'm a believer. (BTW Both cars had power steering.) I can't say I'm crazy about paying $650 for headers either but all things considered, like they don't hang down 4 inchs from the ground like my Hookers do I'm sure they will last much longer, they are tons easier to install, and they also produce more power.