ExhaustPost your questions and suggestions about stock or aftermarket exhaust setups. Third Gen exhaust sound files and videos!
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i was talking with my buddy today about open headers and what to do to make the exhaust street legal. he said you can get a y pipe that has a valve that opens when you want streetable exhaust and it closes when you want open headers or something like that so if someone starts revving their engine at you you can put em to shame lol. is this true?
he was more than likely talking about an exhaust cut out, you just unbolt the cap at the y and there ya go, open y. You can also get them electrically operated versions.
just so you know, running open headers can makes your car faster and a lot louder but its actually really bad for your valves. No back pressure means your valves are going to get worn out faster.
I've only heard an electric cutout on a car once, 86q_ta's car. 305 LG4. it sounds awesome, i'd highly recommend it.
They tend to leak, so even with it closed, it's more rumbly than stock.
and yea, that's crap. There is some correlation to running open headers and burnt valves, *I think*. But that's due to running lean.
I think it also had to do with valves getting bent/warped due to heating up and cooling too fast. Still though, that may have been true in the 60's but not with todays parts and it has absolutly nothing to do with back pressure.
__________________ '91 Z-28 5.7, SLP 1 3/4 headers, 4 inch Mufflex/Flowmaster cat back, gutted cats, Edelbrock intake, 8.5mm Jacob wires, MSD Blaster coil, S&W subframe setup, Jacob Pro Street Ignition, Harwood glass hood, Spohn lower control arms, complete Kenwood system, and a few hidden goodies.
IDP.........bring'n it back once again!
Forced Induction 427?..........................on HOLD!!!
Currently have:
Stealth Ram......In polishing phase
Soon to be World Castings 427 sbc
SLP 25lb injectors
my car is loud with headers open, but only when your standing by the engine, like with the hood open revving it. I can deal with it from inside the car as long as the windows are closed. I just dont feel like modifying my y pipe right now. lol
Open headers wont hurt the valves, it will just kill your lowend torque. Idealy, you should have the cutout closed at take off, then open it as the rpms go up. Cut outs are fun, but the rasp and 5 hp lost isn't worth it. Just get a test pipe and 4 inch mufflex. that will be loud enough.
