gregkono

Contemplating replacing my stock headers/cats/Corsa mufflers on my stock LS6 motor plant.. I see American racing has a Headers to Pre-cats set for $2100 (available in July). This is a track only car and looking to increase the out flow of the exhaust and pick up a few HP and performance. Is it worth it?? Is the install straight forward ? Thanks in advance, Greg in SW Mich....

93Polo

For a HPDE car, I'd go 1 3/4" primaries for the torque unless you are planning on a 402 or bigger build down the road.

Install is not bad IMO. The car will need a tune. So know who you're going to have do the retune or learn to tune yourself. Tightening up the VE and MAF tables shouldn't be hard for a intake and exhaust tune.

When you're running the O2 sensors be sure to tidy up wires to keep them off the exhaust. I use P clamps to attach wires to the trans tunnel heat shield bolts.

Midwayman

For $2100+tune.. eh. I'd just get a set of speed engineering ones and add cats if you want them. Much more palatable for the increase you get.

USAZR1

How's the fit and overall quality of the Speed Engineering headers? I can't justify spending over $2K for a set of Kooks or ARH units.

Prop Joe

They fit fine on a M6 car. I had mine Jet Hot coated. You can have them shipped from SE to Jet hot, then to your house/shop for about $1k with shipping. Plus the X pipe from SE and I cant remember if I paid to have that separate x-pipe kit shipped? I don't think so but you may want to call SE and ask if you go that route. I've purchased headers and had them coated twice now due to a leaky modified TPIS intake on initial fire up after head/cam/header install. I could have left them with the dull coating as it did not fail, but every time I opened the hood it bothered me that the beautiful Jet Hot was now dull and ugly. OCD I guess.
If you use the supplied slip fit tubes and you take it off, you'll need to expand the pipes back to the original size from getting compressed from the clamps being tightened. Not a big deal, just be aware, if you need to take it down for whatever reason. Or you can use the whizz bang flanges like Mr Black and others ave used. You will also need to cut your original exhaust right about where the cross over is, towards the back. Measure twice, cut once as the saying goes. I also had the local muffler shop tack the adapters in place as no matter how hard I tightened the clamps on the SE adapter to OE tubes they would not tighten up and the tail pipes would move on bumps driving on the State of ILL messed up roads
https://www.corvetteforum.com/forums...post1607788936

Mr Black has a good video of whats involved slipping them in:

Edit:
$761 total for headers, X-pipe, Std clamps, MLS gaskets, ARP bolts/washers, plug wires, plug wire sleves and O2 extensions. SE also added taxes and Only $15 for shipping Can't beat it for the price...

lucky131969

Just an FYI. Stock = exhaust manifolds. Headers are aftermarket.

USAZR1

Thanks for that info, Joe.

ipuig

Of course not. Spend your money on seat time, brakes, and tires.