exhaust manifold

[volleygirlamy]

So, apparently my exhaust manifold has a crack in it, which i hear is common for TJ's

Someone told me I should replace it with a header because those will give more horsepower. They are also a lot more expensive. What does everyone think, replace with a new exhaust manifold, or a header?

[Wheelin98TJ]

Technically, the stock piece is a header.

Whatever you replace it with, don't expect big HP gains without doing some other serious work to the motor.

I'd recommend the cheapest fix possible. The $99 special with the expansion joints seem to work just fine.

[RockPaws]

Originally Posted by volleygirlamy

So, apparently my exhaust manifold has a crack in it, which i hear is common for TJ's

Someone told me I should replace it with a header because those will give more horsepower. They are also a lot more expensive. What does everyone think, replace with a new exhaust manifold, or a header?

I do recomend installing a "Banks Torque Tube header" vs. a stock exhaust header. Mostly due to the fact Banks has a life time warranty and are cheaper than the factory model. Banks headers can still crack and a few have. Most others on the market, including the factory model crack. In fact I have a customer that insisted on a factory header.... their on the 3rd header (at 240K miles) and thats about $500 just for the header.

Banks claims their header will add 8-10 HP out of the box. As stated above, with more engine work and more so head porting, more HP gains can be noticed.
I reciently installed a Bank header on my 4.0L along with a fair amount of head porting. It was defiently worth the extra work, approximate gain 15-20+ HP.

Their are a number of cheaper (China) aftermarket headers on the market. I have found problems with them too. Best are ... Made In the USA!

[Dogman]

Originally Posted by Wheelin98TJ

Technically, the stock piece is a header.

Whatever you replace it with, don't expect big HP gains without doing some other serious work to the motor.

I'd recommend the cheapest fix possible. The $99 special with the expansion joints seem to work just fine.

I agree with this. I purchased the $100 model in the link from the banner add on this forum. It's been fine. I can't imagine shelling out $400 for a header.

[volleygirlamy]

alright great!! so i think i will just go with an exhaust manifold then. Thanks all