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You will get more gains by upgrading the headers than any other exhaust component. On an NA engine a cat back system will just make your car louder and may feel a little stronger up top.

Don't bother. It will be worse than the stock. The longer the primaries the better it will work. The black one above is the best design I have seen yet. If it is going to be a tri-Y design then make the primaries long. Otherwise there will be too much interference between cylinders. This is...

ACL make excellent bearings anyway.

So what do you call the bit between the headers and the cat that came with my OBX headers. It's a 2 into 1 section with a cat flange on the end.

Why not modify the OBX headers. They are stainless and the primaries are mandrel bent and nice and long. You could have a collector made that just bolts straight on to the cat and also still slips on to the twin two-inch output from the headers. They do seem to be well made. TIG welded with...

This seems like a good plan.

Just put a heated o2 sensor further down stream and problems solved. The modified OBX seems like a good option. The mandrel bends and merge collectors seem to be very well made. I have a set that I would love to fit but they have clearance issues on right hand drive cars so I am back to our...

The Cressida mx83 and mx75 has a front pulley without a dampener. It's just a solid pulley. Why the difference. I don't know.

There are no relays inside the ECU. It's all solid state.

Where is the high temp water switch??

If it goes away after 2000 rpm then its not rod knock. Rod knocks get louder at higher pm and at higher load. Check for exhaust leaks around the manifold.

Check for oil soaked spark plug leads in the valley between the cams.

Power steering idle up. Detects a load on the power steering pump and then increases the idle to compensate. That small hose is the filtered and metered air supply for it. If its working well you can barely notice it.

The head looks to be in very good shape. They usually have a lot more corrosion around the water passages than what yours has.

jkm3141 Is that your AFM on its side? Any particular reason for that?

I got an aisin oil pump off ebay

Does anybody know why the supra Y pipe has a little cover plate just where the two branches of the Y meet? I have seen some with and some without that little cover.

The cressida engine ECU and the gearbox ECU are in the same box. Do you mean unplug at the gearbox end or at the ecu end?

I could bodgy up a switch for you that lets you manually select 2nd gear. Also you may want to manually lock up the torque converter. At our last dyno day it gave an extra 5rwkw with the torque converter locked. I have another spare ECU at home that could be set up as above.

He wasn't trying.