Good-Win Racing Mazda Performance Parts

Header Gasket 99-05


Miata 1990-2005 · Exhaust · Headers

Part Number: 61-037099

Application: 1999-2005

Price: $12.60


Header Gasket  99-05
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These do-nut style compression gaskets are used between various exhaust components in a typical Mazda exhaust system. These gaskets are designed to fit over the end of the exhaust tube that extends slightly beyond the edge of the mounting flange. Once seated in the recess area on the flange, these gaskets will compress when tightened, providing excellent sealing qualities. Mazda part number - LF45-40-305 This gasket is used on the following Miata applications: - Between the 1999-2005 Racing Beat header and the connecting pipe (stock or the Racing Beat Race pipe) This gasket has a larger ID than the factory gasket that would normally be used at this connection. - The inlet to the muffler on the 2007-2010+ MX-5 Miata.
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I got the oil cooler installed and I'm diggin' it! Thanks. (product # 10-10012)

-- Shon

After reading many other positive reviews on both the GWR and Miata forums I finally decided to buy this product. My main concern for many months was whether or not I was up to the task of installing the header. But with the excellent instructions on Brian's forum as well as several Miata forum threads it turned out easier than I expected. After receiving notice that the header would arrive on a Friday afternoon, I began the disassembly process. After about 3 hours I had the stock manifold out. Later that afternoon the new catted header arrived right on schedule. And it is a thing of beauty. I opted for the stainless version. Installation on Saturday morning took another 3 hours, although I could have shaved some time off of that but I was actually enjoying the process of double checking torque values and cleaning up my engine compartment. I already have the GWR catted midpipe, so that connection was a snap. I put everything back together, reconnected my battery, and went for a drive. NO CODES! Nice throaty sound with my RSII muffler, and a significant boost in power and low/mid torque. Another happy camper here. I since have added a M-E tune and I feel I have realized all of the gains that Brian has achieved on his 2012 project Miata. I've put several hundred miles on my Miata since the install with zero problems. This is the car that Mazda should have built all along. Thanks Brian.

-- Ron P.