Rock-Solid Rods. One of the most impressive hard parts in the 6BT Cummins is its forged-steel connecting rods. The I-beam units can handle 1,000 hp with ease, and significantly more than that in racing applications. In fact, a set of shot-peened, micro-polished, and balanced factory rods can hold up to more than 1,400 horsepower before bending. Join miata.net forums. Lots of info there. Engine might handle sub 220 reliably. As tunning gets better for FI more power should be doable. The ND2 engine might like fi better then nd1 due to better flow and injectors. Also forged crank. The transmission remains an open question. The kit takes about 4-6 hours to install making it one of the. easiest and cleanest modifications you will ever do for an instant 50% hp. gain. 10 bolts and 12 hose clamps are all it takes to fit the kit. Complete. step-by-step instructions with photos included. For more information: www.GoMiata.com. This is realistic considering a 638 horsepower Corvette C6 ZR1 can do 205 mph with better aerodynamics and gearing designed for potential top speed runs. We don't know how much this Miata will Now, for 2019, Mazda has introduced a new engine for the Miata. This mid-cycle refresh, dubbed “ND2,” is also equipped with a 2.0-liter four-cylinder engine. But it now produces 181 horsepower, and has a higher red line of 7,500 RPM, versus 6,800 in the old car. These changes are due to a new block design, higher flowing heads with more Description. Specifically tailored for your modified Miata, these clutches are simply the finest available. All clutches come complete with Pressure Plate, Clutch Disc, Throw Out Bearing, Pilot Bearing and Clutch Alignment Tool. We carry two stages depending on your torque requirements. Warranty. A 13B engine should be able to produce over 700 horsepower as long as you modify it well. You will need to build out some of the internal components, but the block should be able to handle the extra pressures. There are examples of RX-7 and RX-8 vehicles out there with over 700 horsepower still using the stock 13B. 5-speed trans of any year holds up to about 250wtq. Not hp. Stock connecting rods inside the block also only hold to about 250wtq. For example, a Rotrex powered block could make 250whp but only around 190-200wtq and never pop the block or the trans. Versus a turbo which the torque and horsepower numbers a significantly closer to each other. 16. D1VA.