getto

This was the reply for my question about Scion tC mods and the guy talked about mods that wat could happen to the tc. I need ur opinnion about the answer if it is right!!

Here's the answer...

CAI's are CAI's don't pay a trillion dollars for piping and a filter. Shorties only help you when the engine is cold, after the engine compartment gets warmer it is sucking warm air into the engine and performance gets flat.
Headers are ok, but kill gas mileage for 10 hp, biggest thing is the sound the exhaust produces is higher pitched after. Let me warn you, the oxygen sensor can be damaged by the stock manifold removing it and replacing it, you cannot pass ODB2 inspections with a header because it throws a code. In installation and installation of the header the O2 sensor gets its threads messed up because of the soft metal they used in them. O2 sensors are $187, the universals are hit or miss if they will work or not. Also you need to have an engine damper installed with a header because the rocking of the engine will put pressure on your header and cause it to crack. So there is another $130 for the damper.

tCizzler

NONE of that is true, except the higher pitch after header install. It's usually called rasp. And yes aftermarket O2 sensors are hit or miss, but usually miss.

1)CAI's are built differently. some have smoother bends, less turbulence near the MAF sensor, higher flowing filters...etc. And SRI's allow more air to the throttle body, whether its warmer or not, more air= more ponies. And if you want to remove the possibilty of heat soak, wrap the intake pipe in insulation tape. About 5 bucks at Home Depot. Not pretty but works well.

2) Headers don't hurt MPGs, In my experiences, they actually help it. If removed properly, the O2 sensor threads will not be stripped, unless CRANKED on at one point in time. And yes you will pass the OBDII test with the anti-fouler trick. However you won't pass the snuffer test, which i don't think many/any inspection places use any more.

3) No need for an engine damper. Do you need one for the stock header?? No. So you won't need one for an after market header. If it cracks, it's because it is a poorly manufactured no-name brand. The flange where it connects to the rest of the exhaust is connected with 2 flex bolts to address this issue.

Hope that helps

Dakine

headers do hurt MPG. robbed about 2 mpg from the AW headers.

shadow12one

lol Yahoo Answers is a bad place to ask questions regarding things like cars. Better to find a forum like this one and ask the questions here (if its regarding a tC)

draxcaliber

that is damn near impossible.

when you open the throttle of your car, you are letting air in. your car mixes about 12.5 parts to 1 for optimum performance. the more air in your engine, the more fuel your engine has to add to prevent running lean. this is why cold air intake (more, denser air) and superchargers/turbochargers (forced compressed air), cause you to lose mpg, because getting more air into the engine means you have to add more fuel to prevent detonation.

your header and the rest of your exhaust is just piping to evacuated the gases resulting from the burnt air and fuel you just exploded. therefore your header has nothing to do with the amount of air or fuel going into your engine, all it does is help get it out once it has been ignited. you decrease in mpg which isn't that significant can be due to a number of other circumstances, not simpley swaping your header.