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Originally Posted by Zulu28
Long tube header review. 2014 Z/28 50K miles, all highway. All of my previous cars (2001, 2003, 2005, 2008 Corvettes) had headers. All were LG except for the 2008 Z06 which were Melrose Monster-Flow. All of Lou's products are top-notch so I went with them again for this car. BIG MISTAKE!!!!!
Pay the X-tra $ and get the ARH. LG really dropped the ball on these. The passenger side goes on with out any problem but the driver side does not fit without hitting the oil cooler. I ended up taking a hammer to the down tube in order to make it fit. I mean; the thing would not even bolt up until this was done. The rubber boot on the steering shaft hits the header. So far, it has not caught fire or melted but it is in direct contact. For performance; of course I threw a code even though I went with the hi-flo cats. Before tune, I lost torque down low but picked up HP on the top of the RPM band. A tune is imperative with long tubes on these cars. After the tune (done by DBR in Spring Hill) regained the low-rpm torque and gained HP throughout the RPM band. Hindsight; I would do it again but go with ARH. They just fit. Did not have any pre-header or post-header dyno done but I can tell a noticeable difference in the car.
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I am surprised to hear about the low end torque loss. I have ARH with cats and that's where most of the gain was felt, right off idle through the mid range to about 6500 / 6600 RPM. I was shocked at how much torque at low RMP it had gained as I was prepared for a loss not a gain. I have no tune and no plans for one.