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Mine was bad and it made it smoke and run like crap.

Pcv valve?

Cat back is from the cat on back. You might ask the seller.

The second pic is a replacement Y pipe and down pipe. The Y pipe will probably be a pain to change.

If the car does not meet U.S. Federal safety standards and have the tags that say so the U.S. Government will not ship it. Check with customs on the base in Yokosuka if that's where you are going. Usually a car can be shipped for a PCS move but only 6 months sounds more like T.A.D. When I had...

O2 would make it run rich but you should see some change up from 10 AFR. Mine atarta in the high 12s low 13s during warmup. Have you tried trimming fuel with the neo? What does the AFR do at 4500? Can you check fuel pressure? I have allways used manual harness so check what kornfedmk3 said.

What injectors are you running? 02 sensor? they get lazy over time. Have you done a compression test? Stock setup shouldn't need a neo.

The 2J blade will also have issues with the shroud without being trimmed. If you clean up the surface rust on the pump it might go on.

Sounds like something with the exhaust but even a restrictive one will allow some boost before killing power. I had a stock exhaust that on the dyno it would go from 290 ish and drop way down because of exhaust. Went to a full 3 inch and made 305 on dyno. You just changed your whole exhaust and...

Timing could be off. I had a code 13 after my second JZ swap and the marks looked good but turned out the crankshaft was off by one tooth. The crankshaft rotates twice for every camshaft rotation so the crankshaft being off a tooth is not as obvious as camshaft being off one tooth. My motor...

W58 calls for a 35:10 gear according to this http://www.toyodiy.com/parts/p_U_1991_TOYOTA_SUPRA_MA70L-BLMVFA_3304.html The R154 uses a 33:10 which will get you close, p/n 33403-29135 What gear is in there now?

If your running tbe stock turbo which is water cooled then hard boosting on a stock cooling system could be an issue. Contributing factors could be oem rad, weak fan clutch, no under cover, no shroud, constriction in cooling system, weak water pump, running no coolant (straight water) low...

Started as an NA and has a "wablo" fuel pump

The 440's are the same size as the 370's, did you put petrolatum on the O ring to help seat and seal them? Did you pull the rail to do it or just drop them in? there is a seal on the bottom for the pintle cap that might have come off the 370's and stayed in the rail and might be jamming it up.

Koyo also makes a stock OEM replacement you can see at DM, thats what I am using right now and I haven't had any overheating issues, also running 2j fan clutch with trimmed 2JZGE blade. I have gotten hold of the Advanced auto parts 2J clutch that can use the 7M fan but haven't put it on yet.

The fuel pump is accessed by dropping the fuel tank where you have access to the hanger, the sending unit is accessed from under the rear tire cover. If you can get under the car you can check the wiring coming out of the tank, a lift or a pit would be ideal. The fuel pump relay is on the...