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I take it the Tundra headers don't fit?

He can probably run the V8 Tundra cheapo chinese shorties.

McLaren Unveils 2012 F1 Challenger http://www.windingroad.com/articles/news/mclaren-unveils-2012-f1-challenger/

The GS/LS manifolds vs the SC manifolds. Actual pics are of early SC400 manifolds with the only substantial difference in 98-00 being no EGR port and slight larger 3 bolt catalyst flanges.

Actually for 98-00 years the GS400, LS400 and SC400 all have the same ratios in the differential at 3.266 ~ (3.27) and in the 5 speed transmissions

I haven't had the chance to do a back to back comparison but it MAY be the target market. My LS400 VVTi throttle is my least favorite part of the driving experience. I think that Lexus did not want to scare some of its owners with too quick of a responding car. There is a 10hp/10tq...

NO... do not cut off everything after the converters. KEEP the stock Y pipe from the converters to the single middle section. My recommendations were from the single mid pipe and back.

I don't think you are getting what the problem is. Here is a picture of the 3UZFE block from this site. http://www.lextreme.com/3uzblock.html This is with the stock 91mm bores. The distance between cylinders is only 14.6mm. When you try to run your 98mm bores you lose 7mm of...

Have these sleeves been proven in another 3UZ or xUZ engine? I doubt it. Sleeves must fit precisely and securely to provide stability for the area between bores. All engines "move" or "flex" during operation so gasket sealing is an engineering exercise. The less metal between the bores...

I think the intercooler core and the end cap flow will be a bigger issue than 2.5" vs. 3". Also, is the outlet ID or OD 3.00"? Most likely OD with apx .25" wall thickness. If so the ID will be more or less 2.5" anyway. Smaller pipe routes easier and weighs less for a given length. I...

Anything you do will change the sound. Some very little others a lot. The turbo type mufflers you have in the middle positions are likely resonating into the car and the remaining sound is not loud at the back giving your symptoms. The GS400, GS430, LS430 and SC430s all used straight...

Mike, welcome to Lextreme! I have briefly reviewed your build thread and your attention to detail is impressive. Great work. I am certain you will create an equally impressive V8 build. I look forward to seeing your 1UZFE transformation on your Supra.

I doubt you would notice the difference in power with 200cpi vs your current 400cpi cats. The 200s may be a touch louder but with mufflers that would also be minimal.

The 1998-2000 model year VVTi 1uzfe USDM engines came with high flow metal substrate catalysts. These are very good and should be utilized if your vehicle has them. The earlier and later engines used ceramic core cats which are sufficient and should also be retained. The stock manifolds...

Ivan, not sure which year or model Lexus you have. I certainly understand the desire to build a "better" exhaust. Please define your goals. Total horsepower, NA/turbo/supercharger/nitrous and your vehicle use. Since you want to remain "legal" I am assuming moderate mods with good...

Does this help? 2001+ w/center cat

This from a BMW S1000RR motorcycle engine running over 14,000rpm. You can see the valve springs rotating and be amazed that parts move this quickly. Remember, each valve even equals a cylinder filling with air or the exhaust leaving. 118 times per second...

Very interesting (to some of us anyway) documentary from F1archives.com showing the development of the Ford Cosworth F1 turbo engine. 1.5 liter turbo engines (91.5 cid) from the turbo era making over 1000hp The displacement equivilant of 3 cylinders from our 4.0 liter 1uzfe The equivilant...

Quick conversion of kW to HP is multiply by 1.34 215 rwkw (x 1.34) = 288rwhp 4U, are you saying 275rwhp? (aka 205rwkw) That would be incredible since the typical 1st gen makes apx 175rwhp (130rwkw) Most 1st gens with headers, exhaust, intake mods and tune make in the 210-230rwhp...

See my post on page two. RMS (Erol) made: 306hp flywheel at 6500rpm 270tq flywheel at 5000rpm Here is what it took to get there on an otherwise stock long block. Definitely a MAX EFFORT on a stock 1UZFE long block. "Initial dyno figures, stock unopened engine, Slide plate...