i run 30mm inside my exhaust manifold im not sure how long it is though it came from
ThermoGuard Instruments its got a digirtal readout and was heaps cheaper than i could get a gauge pyro setup you got to mahe sure it doesnt touch the manifold other than where its screwed in i was told
and just out of curiosity whats your top speed as for some reason mine only gets to 100kmh even with 9psi boost 3" exhaust and sits on about 2700rpm