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A pic for the "fancy" and "tricky" part.

Some ducting pictures for ideas:

Ok, first of all the original "shroud" was no such thing. The fans protruded to the core and the "shroud" surrounded them and was actually a air BLOCKER. The only flow you had was through the fan holes so you only had two 12" round holes for flow. The new setup without a shroud is much better...

As David and John have mentioned... alignment. It can also be a flexing mounting point that moves when torque is applied. Mounts need to be SOLID.

Welcome! I like your idea on using the floorpan and adapting the bodywork to the Lexus running gear. IMO the more of the Lexus you can keep the better. Heck, maybe try mounting the bodywork the as much of the car as possible. Remove the fenders, doors, roof, windshield and see just how...

Best place to start is with our member JustenGT8 How does 400+rwkW (540rwhp) sound? http://lextreme.com/forums/showthread.php?t=1140&page=7 Here is a vid of an 11.7 run @ 122mph http://www.youtube.com/watch?v=Q_rKZXYIsX4&feature=watch_response

Make certain the air cleaner to turbo piping is ridgid and cannot collapse. As the turbo increases inlet flow any restriction can create a partial vacuum. This can cause flexible rubber tubing colapsing dramatically reducing inlet flow, spiking the pressure ratio taking the turbo out of...

Here is a picture of the 1st gen LS400 which is very similar to the SC400 with oval middle mufflers. You would cut AFTER the second Y section splits it back into dual and replace back to the flanges with 2" pipe. I would have the exhaust shop re-use the flanges by welding them to the 2" pipe.

SPF is right on with his advice. In addition the middle mufflers are worth removing. The stock catalysts and stock Y pipe should be kept. The center single resonator should be replaced with a piece of 2.50" pipe or a 2.5" straight through resonator like a Magnaflow. DO NOT cut the stock Y...

I second (third?) the valvesprings as likely being blown off their seats. The 1UZ block is NOT your weak link. Your transmission will go long before the block. Keep the light weight block and maybe upgrade to VVTi heads and intake manifold. Someone HAS to solve the oil supply to VVTi...

Very nice although I suspect your transmission will not last long. A650E 5 speed correct? http://www.clublexus.com/forums/performance/501584-info-leading-cause-of-transmission-failure-at-elevated-power-levels.html I think 330rwhp may be a safer limit for trans longevity. But hey...

Uhhh... doesn't sound like the "support" is located in the USA...:confused:

In the US the 98-00 have the VVTi engine, the 5 speed automatic and the body style and slight interior changes, 290hp, 300tq. The 95-97 had the 260hp, 270tq engine with the 4 speed transmission.

What engine year / car combo are you starting with? What sump year / car are you trying to use?

The typcial tuning trick is to lean the A/F (air/fuel) ratio under full power conditions to increase power. This is typically done by modifying the signal from the MAF meter to the ECU in order to lean the mixture. The problem will be that the ECU is programmed to maintain stochiometric...

SAE decided to more tightly regulate the testing for engines that wanted to be claimed as SAE certified tested for power. From wiki: Society of Automotive Engineers SAE gross powerPrior to the 1972 model year, American automakers rated and advertised their engines in brake horsepower...

I am VERY interested to see how durable the BW titanium-aluminide (Gamma Ti) turbine wheels will be. Go to page 43 on this PDF link: http://www.treadstoneperformance.com/prod_imgs/installation/ul/install-38.pdf At about HALF the weight of an Inconel wheel the response from this design...

Very strange. Sounds almost like limp mode. Almost worth finding an ECU from a wrecking yard to test against. Worst case you will have a back up or you can sell the ECU on ebay if it is not your problem.

Actually, I am John Brady. John Cribb is also a knowledgeable member. Not sure about your question but a sway bar vs no bar should be noticeable.

What is your goal and what is your budget? The 2uz has 2 bolt main caps and skinny piston rods. It is not known for durability when boosting in stock form. I would limit your peak power to roughly 300rwhp which is doable with a medium size turbo. The newer turbos have higher efficiencies...