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PPE 1UZ SC400 HEADERS 1991-2000PPE Engineering is one of the longest running header suppliers for the Toyota/Lexus UZ V8 platform, and it's easy to see why! These headers are hand welded on a jig and nicely ported afterwards. These exhaust manifolds are made of 100% 304 stainless steel using a 4-1 design, and feature 1 5/8" runners with smooth formed collector and 2.5" outlet. Power gains are 18-20 whp and 20+ ft lbs!These headers will require you to modify your stock catalytic converters. These are not a direct fit to factory cats, you will need to use high flow cats, or make test pipes to fit. These are longer than stock manifolds. These Headers are built to order, Current lead time is 6-8 weeks once order is placed.