I was just wondering if it matters what order you buy and install a intake, exhaust, and header for any reason at all. My car is stock performance wise, and im about to start the I/E/H combo. Seems as though most people tend to get intake first, then exhaust, and then a header last. Why is that? Is it just because they are buying in order from cheapest to most expensive? I mean would it be weird and not good for the engine for some reason to buy and install for example... a header first, cai second, and exhaust last? Or does the order you install them completely not matter?

 

it really doesn't matter, most people do intake because its cheap... compared to a full exhaust...

 

most people go with the IHE setup, because the intake sucks in the air, then the headers supplies the air/fuel mix, then exits out of the exhaust. that's the order it goes in. now, does order matter for performance? that, i don't know. either way, in the end, you'll have the IHE setup, which will yield the same amount of power regardless of the order you put it in.

if i'm wrong, please correct me.

 

No real order to it really. I mean I did mine I/E/(H with s-pipe) The intake will allow air to come in slightly easier and in theory, cooler. Getting the exhaust done will allow the exhaust gas to exit easier, don't go too big b/c then you lose the performance you try to gain from it. 2.5inch exhaust is basically great for naturally aspirated motors and turbos up to I think 300hp. The header is usually last b/c its the most expensive and usually makes the car sound like crap and like a very annoying honda civic, until you get some good resonators on it which will kill that sound and it'll be sweet. Basically they all go hand in hand and you would see/feel the most gains at once by doing them all at once. Do it in baby steps and you won't notice too much, the header gives the most gains though b/c the piping will be "smoothed out" on its curves and the cat on the header will be gone eliminating some restriction to give you better exhaust flow but has other consequences. By doing them you lose low end torque but gain high end horsepower. So if your like me and you live your life in the 3.5k rpm range and above you'll love them, if you like to just try to speed off the line at a red light you may notice a slight decrease in torque. You gain some and lose some with these mods. Thats what F/I is for Hope this helps some.

 

Oh and another side note if you didn't know already, if you get a header, you need to do whats called the antifouler mod or get a CEL fixer that a guy sells on here to get rid of the CEL. If you have one of those you will automatically fail your smog check over there in CA. Just a forewarning.

 

Thanks amdforever for all the great info. I think i will do what you did and just go I/E/H. Here's my plan in this order...injen cai, precision axleback, MMW header/spipe with CEL antifouler, and depending on the most likely outcome of rasp, maybe i will get one of those aero AR25 resonators(will one AR25 be good enough). Also, maybe get a ingalls torgue damper(with dynamat), to minimize engine damage from torque movement.

 

NP man, we're here to help. Sounds good, but just know with an axle back your not getting any gains really. With an axle back that is really what it is, it replaces the stock piping over the rear axle, muffler and tip. To get a full exhaust with your header/s-pipe is to do a cat-back. That will replace all the piping after the second cat. If your not too worried about a few ponies then the axle back should be fine for you sense you will have the stock midpipe with has a built in resonator already. If that resonator doesn't work for you then you will have to go either catback to get a new mid pipe to cut and insert the AR25, or go to an exhaust shop and have them make you a custom mid pipe with the AR25 in it. If the stock reson. works out well then that will be good as the smaller midpipe will help keep your backpressure which means you will keep a few ft/lbs of lowend torque. If you need to use the AR25 I'm honestly not sure if one is enough or not. There are a couple of people on here using one that say it virtually eliminated all rasp for them except just a small barely audible amount. I personally am going to have two put on my magnaflow cat back since they are flow-through designed so they won't leech any performance from me. Going to have a shop weld them in and get the full cat back welded up too. Oh, and the CEL for the MMW spipe is a hit or miss too from what I've gathered. If it doesn't work, try checking out one of these, I'm using it and it's working great so far, that is if your CEL antifouler doesn't work. https://www.scionlife.com/forums/vie...210&highlight=

 

I'm glad you got your ? answered EnoLiddell!!

I didn't think the order mattered much, but it's always good to ask people who have an I/H/E set-up just to be sure.

 

Yeah Hyghgynx im glad i posted this thread thanks to the suggestion by a certain dude you may or may not know lol.

 

Glad to help you out. Any other questions just shoot me a pm.

 

I have mmw header & s-pipe, injen short ram intake and ingals stiffy as far as rasp there is very little. When im sitting still and rev it up to 5 or 6 rpms i can hear it just a little when i let off it.

The short ram is from a camry, I wanted to get a short ram intake when i bought my car but they didnt sell it yet. It fits nice and everything works fine(far as mas air sensor) i will post pics soon as i figure out how.

I plan to get a precision exhaust_ soon as i save some money. I like the set up i got now just need a little more noise HA HA

 

Most ppl do I/E/H. But there is no wrong order.