I would connect the fixture to the other side head flange also. The side with flex joints will move once you cut the cat out. :)

yup, big difference - that said, not sure $300 will get you those differences. not all aftermarket headers are equal. I'm betting properly modded stock headers would produce better results than many low end headers out there (not to mention fit/finish/build quality)

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Pfft! Like you would know anything about welding headers!;)

I agree. Nothing fits like oem. Oem will probably outlast them all as well. My point is that all this effort could be directed at a used aftermarket header and would yield better results. Obviously there are a few short tube offerings that are worth shit but every now and then a good one shows up in the classifieds.

I 100% agree, some really well built long tube headers can be purchased for around $500ish used, and with a proper tune can really change how the car drives.

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I appreciate the insight. Now that I am sitting here looking at it, Jdl, you are correct I should run a piece across to the other side. What do you think, If bolted another small plate to the other side and instead of welding that all together as one unit, I could additionally bolt a stout piece of flat stock from one plate to the other one side. Then when we do cut out the cat if there were any amount of deflection from the expansion joints, this would help to keep everything even more tolerant. I am not an engineer by any stretch of the imagination, just trying to keep the ole gray matter in ops chk mode. Do you thing that would be enough? Again thanks for your input. Steve

hey don't listen to us armchair "engineers" over here, you don't know the real life results until you build it and test it. I've been waiting for someone capable to do this and document it, thanks for stepping up.

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Do you have a build thread? If no considere to make one and document all you done there with pics. Some people here like to see custom/DIY works on this cars

Teseo, I haven't yet but I sure will. Thanks so much I will keep you posted. Best regards Steve Ultra and Jdl I didn't stress the jig just centered bored the holes and bolted everything up nice and tight on the cross over brace and plate. Thanks I finished it up this morning. My Invidia over pipe will be in tomorrow so on tues I will spend the day at my friends shop. I will post so the finished unit hopefully by the end of the week. Regards Steve

Hey, Steve. On your jig, like @JDLAutoDesign said, you want to reference everything to that opposite flange.

I like your style! Keep it up!

Just dropping in an update. I am gonna try and get by to pick up the cat less stock header tomorrow. I post some updated pics.

Modded FRS cat head pipe.
 

I picked up the de catted head pipe today. I think he did an amazing job on the collector. I went ahead and had another bung put in for future upgrades. I forgot to weigh it with the cat. I weighed it after the mod and it weighed 13.4 lbs. When I get my stock one off tomorrow I will weigh it for comparison. Based on my jig I am striving for it to bolt right up without any tweaking. I'm installing it with my Invidia overpipe, stock front pipe and invidia Q300 exhaust. I will update the final setup tomorrow. Thx Steve Sorry about the pics being inverted, I am not the most computer savvy.(Ha) I am going to learn by this weekend how to rotate them correctly. I take them in the normal position with my I phone, but for some reason here lately when I send them from my phone to my computer they seem to be coming out like this (DDDooohhh). I apologize in advance.

Looks good!