EMI 552 COMPLETE HP EMI THUNDER 3 INCH TALLER SYSTEM FOR BIG BLOCK CHEVYEquipped with our performance Stainless Steel High Flow Risers, these are our best performing systems. They are a direct replacement for more many stock Mercruiser manifolds in Bravo and Alpha applications where the exhaust risers are 3" taller than stock (if you have existing exhaust outlets, you should check our dimensions to determine fit before ordering). The 16" long riser is a must with High Performance camshafts to prevent reversion (water

There is no need to purchase additional custom pipes

They are a direct replacement for stock Mercruiser manifolds in Bravo and Alpha applications that utilize a 3" spacer block between the manifolds and risers and where the exhaust outlets exit through the transom in the stock 3" taller location

(Brackets are mounted on 18" centerlines)

They out perform all other pans available

They place the centerline of the cooler approximately 3" above the mounting holes

It is necessary to remove the spring and clip for installation which requires a 3/4 mounting hole

These are available in all the anodized and Fusioncoated colors

Receiver for Autometer Multi-Function GPS Speedos WILL NOT WORK with Speedos other than Autometer MF Speedos Coaxial input Cable

Adjustable Lever Resistance while still installed Available with Bent Handles only

Made from stainless steel and black Fusioncoated

3/4" NPT pressure relief port

This complete commitment to performance has enabled Airflow Research products to find themselves on the fastest performance boats in the country