Trysten711

i got a injen cold air intake and just bought an injen cat back exhaust and i cant seem to find any horespower/ torque ratings. does anyone have any idea of what together the increase might be?

NurSpec

my guess is somewhere between 8-16. Not too much, but it will free up a nice amount.

ack154

iTrader: (7)

You might have maybe 6-8whp total. MAYBE. Virtually nothing from the exhaust though. Maybe 1whp. But doubtful.

Trysten711

what would the gain be with megan headers and invidia down pipe???and the cai and exhaust cuz i want more a gain than that

ack154

iTrader: (7)

I don't know what the Megan headers actually dyno for... but I'd guess no more than 10 to the wheels from that combo.

I'm just guesstimating on that though, so I could be off.

You're not going to get that much gain with any bolt ons like that. Maybe with the proper intake, header, full exhaust combo, you could maybe get to 20 whp.

Trysten711

none of that is going to mess up my air fuel mix right?? i dont know if the make some kind of new way to get the mix to be close to factory but i do know it isnt good to have the mix to far off right?

Mid_Life_tC-risis

Injen's "catback" exhaust is actually an axleback. (A "catback" exhaust would include a replacement for the midpipe as well.) An axleback replaces the chambered/baffled (i.e. restrictive) stock muffler with a straight-through muffler. It will give you more than 1whp, any axleback will give 5-6whp on an otherwise stock car.

https://www.scionlife.com/forums/viewtopic.php?t=80070

Your Injen intake gave +8whp when setup with the Alphawerks header.

https://www.scionlife.com/forums/viewtopic.php?t=92108

A header will give ~7-8whp when setup with an axleback.

https://www.scionlife.com/forums/viewtopic.php?t=82724

However you will need to buy a new resonator (which is actually another straight-through muffler) to combat the raspy noise which results from adding a header to this car.

An s-pipe will give almost no gain on an N/A tC, and is not worth the $150-200 price.

I have specified the above hp gains with their setups because mods are not additive and every intake/header/exhaust component is designed as a single bolt-on. Since no one makes a tuned I/H/E system everyone will get different results from mixing & matching bolt-ons from different companies.

If your mileage doesn't change much and you don't get a CEL, your air/fuel will be fine. If you're still concerned about it you can buy a fuel management system (Camcon, E-manage, etc.) and have it tuned by a professional on a dynamometer. However, this gets to be very expensive unless you can get free dyno time, so almost nobody invests in fuel management unless they have installed a turbocharger.

Trysten711

appreciate it i was just wandering cuz i dont wanna mess up my tc besides the injen cai does really good so far, i cant wait for the exhaust to see wut happens then