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for some reason im led to believe those are like the OBX headers. i wouldnt mess with them as the fit was junk and the welds cracked. i would just go MSDS or CPE for headers on the V6
 

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You stated not street legal, moving the factory position of a cat is not emissions legal. So even if they had high flow cats, they would not have a carb OE certification anyways.(Which is needed in more states now than just California) So I am not sure if you want headers that it should be a concern, it's just something you will need to know and live with if that is what you want.
Anyone even doing a state inspection (Never mind a smog check) is suppose to do a visual on your emission system. No cats can be a big fine if this would apply to you. Have your factory stuff ready for inspection if need be.
 
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I had an OBX on my MR2 back in the time and liked it very much, not sure why there is so much hating against OBX on this forum as it is seen a a reputable brand in the toyota discussion boards!
 

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I had an OBX on my MR2 back in the time and liked it very much, not sure why there is so much hating against OBX on this forum as it is seen a a reputable brand in the toyota discussion boards!
Just b/c all members that i'm aware that used OBX headers on their 3.0 have had issues. Our exhaust design is pretty complex compared to say the MR2 and other vehicles.
 

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I had an OBX on my MR2 back in the time and liked it very much, not sure why there is so much hating against OBX on this forum as it is seen a a reputable brand in the toyota discussion boards!


reasons:


1. fit (well they dont without a good amount of modification)
2. alternator (well the rear manifold runner closest to the alternator, hits it if the alternator is not reinstalled with spacers, longer bolts and longer belt)

3. alternator spacing (they send absolutely nothing to use to space the alternator, basically each person who would buy it needs to figure out spacing)

4. welds (well the welds look nice on the outside, but the penetration, um, not there. so after some use the welds crack)

5. fit again (the y-pipes and such tend to not line up by a long shot)

6. cats (it only has one cat for one bank which will cause uneven exhaust flow to say the least)


shall i go on?
 

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Sorry to resurrect an old thread but it's relevant since I am now the new owner of a 2003 mazda 6s. Am I correct to assume that the MSDS headers (which seems to be about $500.00 more expensive than OBX) are direct-fit and ready to go? No mods required like to the alternator?
 

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Sorry to resurrect an old thread but it's relevant since I am now the new owner of a 2003 mazda 6s. Am I correct to assume that the MSDS headers (which seems to be about $500.00 more expensive than OBX) are direct-fit and ready to go? No mods required like to the alternator?
Msds headers for your model year are bolt on.

Obx are known to be of much lower quality and shitty welds. You get what you pay for.


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So to confirm what you've likely just said, the MSDS headers I won't need to modify the alternator with spacers? Bolt on, meaning plug and play? Thanks ct, you've been really helpful in all my threads.
 

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So to confirm what you've likely just said, the MSDS headers I won't need to modify the alternator with spacers? Bolt on, meaning plug and play? Thanks ct, you've been really helpful in all my threads.
You don't need to do anything to your alternator as there are no clearance issues for your model year, just like I had no clearance issues on my 04 when I did the install.

Yes they come with all the bolts and gaskets needed to replace your exhaust from the manifolds on the block to the mid pipe connecting to the cat back.

No problem man, always happy to share the little knowledge I do know, lol.


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