Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

exaust testing on old carb motor

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Old Apr 29, 2008 | 10:28 AM
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Default exaust testing on old carb motor

i been thinking to my self if i upgraded to the magnaflow 3 inch instead of getting the magnaflow 2.5 inch would there be much of a power gain if any? i know the 3 inch will be louder but im out for power not trying to make the car louder...... the bigger 3 inch pipe is hard to fit and can rub in areas plus is over $130 more than the 2.5 kit so i only want to get the 3 inch if its really gonna be worth it or if its really gonna sound alot better and not just louder..... the motor will be a 388 stroker dart ported heads, ported vic jr and solid roller......any thoughts or opinions? jake
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Old Apr 29, 2008 | 12:41 PM
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Well, you will be exchanging some more TQ for HP wuith the bigger exhaust but it depends on if you want the higher output, you gonna stay at lower or higher revs for longer?
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Old Apr 29, 2008 | 03:31 PM
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car will be a street strip car so i want to to run good on both areas of i can...... i think the cam has a 3,000-7,000 power band
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Old Apr 29, 2008 | 09:26 PM
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If it is a stalled car to 3000 or better, screw the little TQ difference below 3000, you wont miss it.
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Old Apr 30, 2008 | 09:29 AM
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at this moment it actually has a TCI 2,200 stall......not the best and i want a yank 2,800 or something in there when i get some more money......
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Old Apr 30, 2008 | 12:41 PM
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Well, if you rely on tq under 3k rpm stick with 2.5 inch exhaust.
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Old Apr 30, 2008 | 01:04 PM
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well i do want it to be punchy down low for street use...... the main thing is i dont want to have the 3 inch rubbing and rattling underneath the car on the tight spots
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Old Apr 30, 2008 | 03:05 PM
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Well, if top end power is the goal it is kind of a sacrafice.
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