will an american thunder 3' in/out fit on my stock 305 exhaust.... or will i have to get the 2 1/2 system?

and where can I find the dual snorker system?

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My parents just gave it to me

89 Formula
305 TBI (ALL STOCK EXCEPT FOR A K&N FILTER)
OVER 160,000 miles.

 

It'll fit. Who ever installs it will simply have to use an adapter to go between the 2.25" and 3".

 

Cheapest way to acquire a dual snorkle setup is to find one in a junkyard or make one yourself (check the archives on this). Buying a brand new one can cost $$$. Consider doing the open air element modification....many people would agree it is much better.

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92 Camaro RS LO3, 5-spd, T-tops
Mechanics:
Open Air Element w/K&N Filter, Flowmaster 3" Cat-back Exhaust, Z28 Grille w/aftmkt fog lamps
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-90 Amps powering 2 12" Pro Red subs and 4 Infiniti speakers.
NEXT UP: SLP 1 3/4" Headers/Y-pipe, Centerforce Dual Friction Clutch kit

 

I agree with the open element method. Not only is there a sound improvment and slight performance improvment, but it frees up a lot of space under the hood, from those snorkels.

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Mike Kenny
Current: 1991 RS 305 TBI
Past: 1990 RS 305 TBI (A woman forgot what red lights are for)
Current: mostly stock - newer 305 w/ 12,000 on it
Eclipse speakers all around w/ 10" tube powered by a Alpine V12 in back
K&N filter w/XStream flow lid - It is sweet!!
Future: 2" Cowl hood

 

I would have to agree as well on the open element idea. If u really want it though find one in a junkyard or here on the net if u can. But if u can't, don't go and pay the butt load from the dealership cause it ain't worth the money.

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Eric Natzke
91 Firebird 305 TBI

ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-MSD Cap & Rotor-MSD Blaster Coil-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone-Free TBI mods
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

i was thinking about doing both, i want to have the dual snorkle system (for extra air) and then I want to put the XStream flow lid. thanks for you help.
oh and whats the size of our exhausts sytems?