changing exhaust......
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Junior Member
Joined: Mar 2004
Posts: 46
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From: Maple Ridge B.C. Canada
Car: 1985 Firebird
Engine: 305
Transmission: Auto
changing exhaust......
hey guys, I have a 305 4bbl carb with a single stock exhaust and i want to change it to true dual exahaust. My queston is...... should I go with the 3" or the 2.5" pipes and what are the best headers i should get??
thanx!
thanx!
Joined: Jul 2000
Posts: 7,386
Likes: 1
From: In a mint Third Gen!
Car: Red 87 IROC-Z28 T-Top
Engine: 5.7 Tuned Port Injection
Transmission: 700R4 Auto
Axle/Gears: BW 9-Bolt 3.27
The 40 Series sounds the best IMO, but if you want dual outlets you have to buy the 80 Series which sounds good too. It's better to buy the entire system though instead of just the muffler.
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Joined: Oct 2002
Posts: 9,067
Likes: 1
From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
IMO Cherry Bomb Turbo's sound pretty damn nice. Not the glasspacks, the 'Turbo' mufflers.
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Senior Member
Joined: Dec 2003
Posts: 905
Likes: 3
From: Weyauwega, WI
Car: 86 Camaro
Engine: none
Transmission: none
Axle/Gears: GT4, 3:73s
i have the flowmaster american thunder exhaust system. i got it right out of summit for 300 bux. It sounds AWESOME. its basically an 80 series.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Fact #1: The typical LG4 305 isn't going to need 2" dual pipes, let alone 2-1/2" or 3" duals.
Fact #2: Any kind of "true" duals on our cars compromises ground clearance.
Fact #3: Any kind of "true" duals with dual oval mufflers will multiply the problems created by #2.
Fact #4: The best overall "system" would be headers, single cat, and single pipe cat-back (single or dual outlets is optional) made for '86-'90 TPI single-cat application. It is also the least expensive system in the end.
Fact #5: The old "muscle car" sound does not necessarily equate to performance. If you're satisfied with appearances ("sounds like...") while sacrificing functionality, rather than spending money in a way that improves performance, go ahead and pursue your true muscle car sounding dual exhaust.
Fact #2: Any kind of "true" duals on our cars compromises ground clearance.
Fact #3: Any kind of "true" duals with dual oval mufflers will multiply the problems created by #2.
Fact #4: The best overall "system" would be headers, single cat, and single pipe cat-back (single or dual outlets is optional) made for '86-'90 TPI single-cat application. It is also the least expensive system in the end.
Fact #5: The old "muscle car" sound does not necessarily equate to performance. If you're satisfied with appearances ("sounds like...") while sacrificing functionality, rather than spending money in a way that improves performance, go ahead and pursue your true muscle car sounding dual exhaust.
Senior Member
Joined: Dec 2003
Posts: 671
Likes: 0
From: North Olmsted, OH
Car: 1984 Pontiac Trans Am WS6
Engine: H.O. 305 5.0L;L69
Transmission: T-5; Axle Ratio 3.73
Fact #1: The typical LG4 305 isn't going to need 2" dual pipes, let alone 2-1/2" or 3" duals.
Fact #2: Any kind of "true" duals on our cars compromises ground clearance.
Fact #3: Any kind of "true" duals with dual oval mufflers will multiply the problems created by #2.
Fact #4: The best overall "system" would be headers, single cat, and single pipe cat-back (single or dual outlets is optional) made for '86-'90 TPI single-cat application. It is also the least expensive system in the end.
Fact #5: The old "muscle car" sound does not necessarily equate to performance. If you're satisfied with appearances ("sounds like...") while sacrificing functionality, rather than spending money in a way that improves performance, go ahead and pursue your true muscle car sounding dual exhaust.
Fact #2: Any kind of "true" duals on our cars compromises ground clearance.
Fact #3: Any kind of "true" duals with dual oval mufflers will multiply the problems created by #2.
Fact #4: The best overall "system" would be headers, single cat, and single pipe cat-back (single or dual outlets is optional) made for '86-'90 TPI single-cat application. It is also the least expensive system in the end.
Fact #5: The old "muscle car" sound does not necessarily equate to performance. If you're satisfied with appearances ("sounds like...") while sacrificing functionality, rather than spending money in a way that improves performance, go ahead and pursue your true muscle car sounding dual exhaust.
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