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I literally just installed an Injen SRI on my tC 2 days ago. SRI is the way to go if you want it louder but CAI is better in the fall/winter because it takes in more cold air obv. SRI definitely makes a noticeable difference in engine sound and performance so I would go with that for a while.
I have a Weapon r sri with true ram air on my xb2. so I would say go with an sri and if you can run a tube from your filter to your grill like I have, that way in the fall and winter you get the cold air that you would with a cai and you get the extra sound of an sri.
Rocky Mountain Scion Club founding/lead member
2008 XB RS5.0 5Spd #1512 of 2500
17" scion alloy rims, SNS100 Navi, 10" Kicker L3 SUB, Kicker DX 500.1 Amp, 6.5" Kicker KS 650 Speakers in rear, custom sub box, Weapon-R Neo-ti ram air intake, Front and Rear tinted windows, Streetglow Light strike 3 Million color LED underglow, Scion third brake light vinyl, NIA eyelids, NST Stainless Steel Shifter Bushings, TRD Quick Shifter, Ksport Kontrol pro coilovers, Hotchkis front and rear sway bars, and much more.
You're not going to experience any gains with an intake except perhaps at the very top end, so if sound is what you're after, go for a short ram intake. Note that oiled cotton gauze filters don't filter as well as paper so if that's something that matters to you then opt for a dry filter.
Former OG tC2 owner: Good riddance!
2013 Subaru BRZ