Stainless Steel Exhaust Manifold, 4-1, MX5 Mk3/3.5/3.75[SI6866]
£395.95 inc Vat
by Martin Pike
Date Added: Thursday 05 October, 2017
I bought this header after I had the ecu on my 2007 2 litre engine remapped and had it fitted at my local garage. The remap vastly improved the responsiveness of the engine - even though increases in bhp and torque were modest (Dyno results showed a 3.5% and 4.5% increase respectively). However after the header was fitted the Dyno readout showed an increase in bhp from 163.5 to 175.1 - with the biggest improvement just where you need it for overtaking, at the mid to high rev range. I expected slightly less torque at the lower rev range - but the opposite was true. From 1800 revs torque increased - and peak power was at 6924 RPM with the engine continuing rev to 7033. This is significantly higher than standard. The rest of the exhaust system remained as standard but I did fit a Pipercross air filter to improve breathing. I also fitted an exhaust wrap (heat shield) around the pipe nearest to the alternator to avoid heat damage. Fabulous piece of kit with fabulous results.
Rating: [5 of 5 Stars!]
Average Customer Review: [After 12 Reviews]