It's taken me 6 months to find a day to finally get these headers installed on the 5.9.
For those who didn't see my thread , I got them off Kijiji brand new never used for $250 delivered to my door faster than a pizza .
I since picked up the new HF cat .
This morning , I decided today was the day . To the garage I went . Should be easy enough , and , for the most part , the install went pretty ok . The headers are quite the tight fit on both sides . The kit fit well and no leaks present anywhere . Not bad . I tossed on the cat and headed for the exhaust shop . Had everything cept the cat welded up , the cat was clamped .
The ride home was a real eye opener , sweet mother of jesus that SOB can sure go now . I can't believe the difference . It reminds me of my ol' 70 Chevelle with a 454 . The power is fantastic . I so can't wait to hit the track come spring . This thing is nuts now . Feels like the fronts gonna come off the ground . Pleased , I'm freakin estatic .
The headers by far registered the most gain according to the butt dyno . Not to be forgotten , the cat and muffler are Magnaflow HF's , and just installed the same time , it all helps . The tailpipe remains stock until I cut the 3" off the Orvis , if I even bother to change it at all .
Yep! Ive got the doug thorley headers, 3" from the collector all the way back with a random technologies HF cat, and magnaflow muffler. Def worth the investment. Now add a bbk 52mm TB, K&N fipk, kolak ignition upgrade and an M1 intake. Youll love it!!! After that, throw in a new cam, harland sharp 1.6 roller rockers, new valve springs, pushrods, ported iron ram heads. Top it off with an SCT tuner. Then youll really be moving