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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 10-06-2011, 11:08 PM   #1
emsguy
 
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headers 101

noob here. want to get a set of headers. am confused by the terminology on threads and manufactuer's websites.

don't want an opinion on whcih brand to buy yet. just need to know if any one makes a long tube header that will bolt up directly to the stock cats without fabrication.

not concerned with squeezing the last drop of horsepower and torque from the engine. want a mellow sound and easy installation. plan to add catback exhaust, so I will have headers to stock cats to aftermarket exhaust.

thanks. please keep it simple. short words. I won't take offence.
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Old 10-07-2011, 06:28 AM   #2
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Long tubes will replace the stock cats. You can only run an aftermarket cat with long tubes. Pretty sure there are some shorty headers out there that connect to the stock cats.
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Old 10-07-2011, 06:35 AM   #3
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Yep, Brad nailed it. Only "Shorty" headers will bolt up to the stock cats. However, not much benefit (performance-wise) to adding shorty headers. However, from what I know, the shorties do not require a tune, thereby keeping your powertrain warranty intact.
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Old 10-07-2011, 06:49 AM   #4
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I have been researching headers alot lately, and you might want to consider going with a set of 1-7/8 long tube headers with high flow cats that have a 2-1/2" connector. With that setup you can bolt directly up to your factory catback exhaust or an aftermarket 2-1/2" system.
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Old 10-07-2011, 07:03 AM   #5
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I believe that shorties require cutting the stock cats though. Or at least the JBA ones do.
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Old 10-07-2011, 08:09 AM   #6
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Quote:
Originally Posted by stieger View Post
I believe that shorties require cutting the stock cats though. Or at least the JBA ones do.
Hmmmm, I didn't know that! I thought all the shorties just bolted right up to the factory "catted" mid-pipes. Learn something new everyday I guess!!!
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Old 10-07-2011, 08:39 AM   #7
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Not all shorties require altering the cats. I know BBK's don't. I don't think the Doug Thorley's do either but I wanna say someone told they do. but that still leaves a few other makes. If you are considering LT's then the stock cats need to go. You can install High flows in their place or go with none at all. If you are concerned with having to tune you can go with shorties and new high flow mid pipe. They get good results.
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