Exhaust valve:0.008-in. max bounce at 7,100 rpm; tested up to 7,500 rpm. TEST 2: Stock cam and springs, with REV solid exhaust valve. Intake valve:0.006-in. max bounce at 7,000 rpm; tested to ...

The Xtreme-S kit will come with a full cat-back stainless steel exhaust system with fully integrated valves and 4.5-inch black chrome exhaust tips. The lightweight stainless steel construction is ...

We’ve covered tons of stainless-steel exhaust systems for the eighth-generation Corvette, but the Lingenfelter Extreme-S is “the best C8 exhaust on the market,” apparently.Other than ...

The C6 Z06 aft-cat exhaust system has shown increases of 23 hp! Check out exhaust systems from companies such Bassani Xhaust, Borla Performance, Callaway Cars, Stainless Works, Dynomax Performance ...

Manhart Performance is known for turning BMWs into incredible machines, though it occasionally dabbles in tuning Porsches such as the near 1,000-horsepower 911 GT2 RS introduced earlier this year. The ...

As GM Authority reported over two years ago, Hooker BlackHeart offers a stainless steel cat-back exhaust for owners looking to open up their 2020-2023 Corvette C8 Stingray.Now, Hooker BlackHeart ...

This may look like a 1967 Pontiac GTO, but don’t be fooled. After a meticulous overhaul, it shares almost nothing with its ...

20-Years-Owned 1979 Honda CBX1000 Howls Via Stainless-Steel Aftermarket Exhaust. Published: 31 Oct 2021, 14:47 UTC • By: ... four valves per cylinder, and six Keihin carburetors.

Other four-barrel upgrades over the two-barrel engines were stainless-steel head gaskets, higher valve lift (an increase of 0.025-inch intake/exhaust), a different combustion chamber with quench ...

Discover Millteks new performance exhaust for the Defender OCTA V8, debuting at Goodwood Festival of Speed 2025, enhancing ...

In a cool piece of trickery, he did use Manley stainless steel valves with thinner stems. Stock 396s are machined for 3/8-inch valve stems (as are most big-block Chevys). These valve stems measure ...