hey.. I will appreciate if you guys could tell me which headers I should get !! I know there is DC-S ,Alpha werks, Magen,I also noticed they're 2 typs; 4-1 and 4-2-1... I have K&N cold air intake and TWM short shifter, I'm also planing to get the S pipe and cat back exsaust... so any feed back?? thanks
tC Headers
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If your looking for best performance... Probably should go with Alphawerks, it is just a little bit better in terms of gains by small margin and if you want something that also looks good in your engine bay. A lot of people running w/headers can attest to this modification as probably one of the best and when combined w/an S-Pipe, and Full Exhaust system you've got yourself some N/A power.
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It's also the only mod that is a Federal violation, and is illegal in all 50 states.
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I thought the tC was an inline four banger? Or are there additional performance gains with headers?
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Ever seen a Volkswagon Bug? How about a Subaru?
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4-2-1. Better midrange power than a straight 4-1.
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I don't know where you got this info, but it's a little bit inaccurate. Longer primary tubes tend to produce more low end torque. Shorter primary tubes tend to produce more high end torque. It's pretty much the same with primary tube diameter. Larger diameter makes more high end torque (higher maximum flow rate) and smaller tubes make more low end torque (better energy retention for a variety of reasons, but not capable of higher flows). We won't even start to discuss reversion, anti-reversion, and auxiliary chambers. There are a number of software programs available on the web that address the design issues and do all the calculations for you.
4 - 2 - 1 works better for street and roadrace applications except on very high speed tracks like Willow Springs. It does this by tying the two cylinders that are 360 degrees out of phase together before merging the flows into the second collector. The reason for this is to improve scavenging in the cylinder pairs that are working like parallel twins in the middle rpm range. 4 - 2 - 1 pipes excel in midrange performance and help raise the middle part of the torque curve.
4 -1 works best for drag racing because it produces the best peak numbers. Since drag racing is what it is, the best peak number with the best gearing will win almost without fail (until you get to the truly exotic classes where the clutch has more to do with winning than anything). There are also huge arguments about which way to pair the cylinders in the collector since some guys want to put the pairs side by side, and other guys think they should be across from each other. Regardless of the details, a 4 - 1 exhaust header will make the best maximum torque at high rpm at the expense of low rpm torque. This is why I would choose a 4 - 2 - 1 for a street engine.
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All the headers out on the market for the tC are illegal(off road use only), Megan used to make it with a pre-cat, but the cone inside the cat was breaking apart and pieces would end up inside the exhaust, so they redesigned without the pre-cat. Even when it had the pre-cat, it was still illegal.
Either way it's still illegal. Let us state it once more:
It is illegal to remove or replace any factory installed working catalyst, even with another working catalyst. Replacement is only allowed in the case of a failed or damaged catalytic converter, and complete removal is definitely not legal.
-Ed
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