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IME back in the 1980s, working on cars from the 1960s and 1970s headers, exhaust and a tune was the easiest and cheapest horsepower available, beating heads, cams and intakes by a wide margin for a lot less $$$.
IME 50hp is a lot to expect from just headers, but I would say 25 is probably a sure thing.
Then you had to just have deal with the headers leaking every 6 weeks ..... which is why I personally never put headers on a car any more.
unfortunately it spun a bearing on the dyno lol so I'll never know.
IME back in the 1980s, working on cars from the 1960s and 1970s headers, exhaust and a tune was the easiest and cheapest horsepower available, beating heads, cams and intakes by a wide margin for a lot less $$$.
IME 50hp is a lot to expect from just headers, but I would say 25 is probably a sure thing.
That's true on many, if not most cars, but the stock LTx manifolds and exhaust are already good. People who've done before/after haven't gained a lot on these cars from headers.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.