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May 22nd, 2002, 07:32 AM
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Im not 100% sure but I don't think they will fit//
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http://turbobuicks.net/gallery2/main...g2_itemId=6504 flyin_gn@yahoo.com 1987 Grand National 
    
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May 22nd, 2002, 10:28 AM
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I have Infinity 4" kappas in the dash (2 way speaker) and they fit, not real good, but they do fit. (If you want just a bolt in, use the 3.5 though)
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-Eric '87 Astroroof GNX Clone - 154k miles, STOCK engine (minus timing set & springs) Brian Hofer Tranny, Big Mouth CAI, Trans+, LS1 MAF, 3.5" MAF Pipe, PT61, PTE FMIC, 60/65# inj., TurboTweak Chip, Dual Nozzle PAC Alky, 70mm TB & Plenum, RJC Plate & Pullies, THDP, Hotwired Walbro, Adj. FP Reg, Scanmaster, Tubular Rear Control Arms, ATR Rear Bar, LPW Rear Girdle, Hurst Line Lock; 1.736(60') 7.58@92(1/8th) 11.83@115 w/ 91 oct. & ALKY, Drag Radials and a 7300 D/A. 422RWHP/502RWTQ  '01 Vette - 6-speed, Tune, Vortex Intake, AR Headers, B&B PRTs, 332RWHP/343RWTQ - Before Headers '81 El Camino - The Parts Hauler, 5.7 TPI, 700-4R, GN 10 bolt, Choo Choo front end, 17" TTII's 
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May 22nd, 2002, 10:38 AM
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there ya go! I was wrong
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http://turbobuicks.net/gallery2/main...g2_itemId=6504 flyin_gn@yahoo.com 1987 Grand National
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May 22nd, 2002, 10:43 AM
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Wouldn't really say you were wrong, if I didn't have the 4" speakers from a car I owned prior to the GN, I would have bought the 3.5". The install isn't exactly pretty under that grill
 .
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-Eric '87 Astroroof GNX Clone - 154k miles, STOCK engine (minus timing set & springs) Brian Hofer Tranny, Big Mouth CAI, Trans+, LS1 MAF, 3.5" MAF Pipe, PT61, PTE FMIC, 60/65# inj., TurboTweak Chip, Dual Nozzle PAC Alky, 70mm TB & Plenum, RJC Plate & Pullies, THDP, Hotwired Walbro, Adj. FP Reg, Scanmaster, Tubular Rear Control Arms, ATR Rear Bar, LPW Rear Girdle, Hurst Line Lock; 1.736(60') 7.58@92(1/8th) 11.83@115 w/ 91 oct. & ALKY, Drag Radials and a 7300 D/A. 422RWHP/502RWTQ '01 Vette - 6-speed, Tune, Vortex Intake, AR Headers, B&B PRTs, 332RWHP/343RWTQ - Before Headers '81 El Camino - The Parts Hauler, 5.7 TPI, 700-4R, GN 10 bolt, Choo Choo front end, 17" TTII's
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May 23rd, 2002, 02:03 AM
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Why do you want to put 4" one the dash anyways? Its alot easier with a 3.5" and there are many different types of 3.5"
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87 Buick Grand National Limit GT6131E, PTE FMIC, 70mm Accufab TB/PTE Plemun, JC power plate and pulleys, RJC boost controller, 65lbs Mototrons, 3.5" Big Mouth cold air kit, ATR 3" downpipe w/ATR external wastegate, ATR 3" dual exhaust, MSD Dis-4HO, Art-Carr #16930 3200 non-lock TC, CAS fuel pressure regulator, Walbro 340 hot wired, Scanmaster 2, QA1's, H&R sway bar, Eibach springs, Air bags. 17" T11's w/315 in the rears! New times 4/1/06 1/4 et 11.38@117.56 mph 1/8 et 7.10@97.57 mph 04 Ford Mustang GT GNRA Member #47 www.imagestation.com/members/HI87GN TURBO BUICK MEMBERS ***BEWARE*** OF BUYING OR SELLING TO MEMBER JUSA6! HID kits for sale http://www.turbobuick.com/forums/par...ml#post1505931
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May 23rd, 2002, 03:19 AM
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Well in that case go with it. But I can't see how you going to fit a 4" in a 3.5" hole, you're going to enlarge the hole and then what the dash won't fit? Unless you squeze the 4" underneath?
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87 Buick Grand National Limit GT6131E, PTE FMIC, 70mm Accufab TB/PTE Plemun, JC power plate and pulleys, RJC boost controller, 65lbs Mototrons, 3.5" Big Mouth cold air kit, ATR 3" downpipe w/ATR external wastegate, ATR 3" dual exhaust, MSD Dis-4HO, Art-Carr #16930 3200 non-lock TC, CAS fuel pressure regulator, Walbro 340 hot wired, Scanmaster 2, QA1's, H&R sway bar, Eibach springs, Air bags. 17" T11's w/315 in the rears! New times 4/1/06 1/4 et 11.38@117.56 mph 1/8 et 7.10@97.57 mph 04 Ford Mustang GT GNRA Member #47 www.imagestation.com/members/HI87GN TURBO BUICK MEMBERS ***BEWARE*** OF BUYING OR SELLING TO MEMBER JUSA6! HID kits for sale http://www.turbobuick.com/forums/par...ml#post1505931
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June 20th, 2002, 01:43 PM
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been there, done that........... then I bought 3.5"..... and $90 for a new dash cover
 ...........just looked ugly!!! and bugged the heck out of me
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. 85 GN "With a little 87 style" stock injectors, 307 fuel pump, Adj reg , 87 ecm- maf , 93 jl chip, 160 stat ,atr up pipe, Spearco IC setup 2800 stall conv, 87 wheels
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