I'm looking at buying a hks Up pipe for $70. All that comes with it is a gasket and the up pipe. Do I need anything else? I heard something about a cel? What is this? Its on ebay, and there is only a couple of hours left, so I need some info fast! Thanks!

 

you would want to get new upper and lower uppipe gaskets and new uppipe studs(5).

 

to even get to the up pipe you will be taking off your down pipe too. I believe its actually the downpipe that causes the cel light. if so all you need is a cel light fix depending on the year of your wrx shouldn't be an issue but your looking at a long LONG install time on your own

 

Don't listen to RoadSpike.

If you replace the factory EGT sensor in the new catless uppipe, it will fail eventually, causing a CEL and/or limp mode (very unpleasant). Therefore, do not reuse the factory EGT sensor, plug the hole with a bolt (M12x1.25), and do the EGT Resistor Mod. This is simple: plug in a 2.2k ohm, 1/2 watt resistor into the EGT plug. Search on clubwrx.net for "EGT resistor mod" if you need pics and more info.

 

he'd still have to do a cel fix if he replaced his downpipe wouldn't he though?

 

i cut my egt sensor instead of using a bolt =X then put in the 2.2k ohm resistor

has been like that for about 10k miles now. Works like charm.

 

totally. i was giving you a hard time.

 

ok awesome i just hate giving bad info

I'm working with a totally catless system over in ej20t forum trying to get the rear o2 sensor to cut its crap out with the p0139 cel code. I think i have a viable solution but you never know till it hits the road.

I should have more info on it by next week when we try out a couple things but *shrugs* anything can happen

 

Does an up pipe void the exhaust warranty or does it void the whole engine?

 

I think that probably depends on how much of an a** your dealer is . I have been told that some do not care and others are highly against it.

Like all performance mods though you definitely run the risk of voiding the motor warranty.

I suppose if you bolt on the stock components they wouldn't be able to tell. Definitely wait for a second opinion or ask your dealer for info.