kooks here!!!! love and they sound awesome with my 3" orx and magnaflow catback. however they are pricey and unless your at 600rwhp i wouldnt recomend.. stock manifolds flow very well as is.
I really like my mac long tube headers. My car sounds more crisp with them. They did help my car power wise. I went from 500rwhp, 515rwtq to 530rwhp and 570rwtq by adding the long tubes and adding 2lbs of boost. I added the 2 lbs of boost because usually with long tubes you loose 1 to 2 lbs. I know some of the power is from adding the extra 2 lbs but the long tubes played a part as well. They were easy to install with the help of a friend and a lift.
My MACS have been on the car for 5 years now, no issues whatsoever and they sound wicked mean! They also provide better ground clearance than other longtubes.
I believe if you did a search you would see that this topic has be discussed many times already. I have ARH and love them. They are a solid one piece design so they will not leak. I know a couple people with kooks and theirs have leaked at the collector because they use a slip-fit design.
If money were no object (i.e. I didn't have a son in college), I'd go with ARH. However, I went with the MAC ceramic-coated headers based on the positive feedback I've seen on this (and other sites). I'll be installing them either next month or January so I'll post up comments after the install is complete...:beer:
I have always heard great things about ARH and voted for them. The vette guys seem to love them. I have BBK's on my car and have no issues with them. My car lives in a garage so no rust on mine. plus i got them used for $150 so the money i saved i had them jet hot coated. If i ever change them out it would be for a set of ARH.
I am sure there were already several threads on this, I did see a few old ones, but I figured a fresh start would give me a more up to date answer. But thanks for the heads up.
I am stuck between saving money and going with Mac's or going ARH for almost double cost. Those with ARH, are you going with the standard or 2.5" collector?