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here are the factory specs on your car:
Engine & Performance
Base engine size: 1.7 L
Cam type: Single overhead cam (SOHC)
Cylinders: inline 4
Valves: 16
Torque: 110 ft-lbs. @ 4500 rpm
Horsepower: 115 hp @ 6100 rpm
Turning circle: 34.1 ft.
Base engine type: gas
DriveTrain
here is the basic chart:
Pipe Diameter (inches) .....Max HP Per Pipe ......Max HP For A Dual Pipe System
1 1/2 .................................78 ....................................155
1 5/8 ................................. 92 .......................................185
1 3/4 .................................108......................................... 217
2 .................................144 ...........................................289
2 1/4 ...............................185................ ......................... 371
2 1/2 ................................232............... ............................. 463
at 6k rpm, the BRAND NEW Civic made 115 hp. THat is an unsustainable rpm over more than 5-7 minutes on a used car.
given a 10 yr old car, the MAX hp is maybe 100.
I'm not sure what 'how you drives' means, but you are on an mpg thread , which implies low rpm.
factually, you need to be at 1 3/4 MAX and in reality, 1 5/8.
If you have a scangauge that is correctly calibrated, you can see the hp being produced at cruise.
What most people seem to do is think that the pipe should reflect the max horsepower of the engine, and that is incorrect. the pipe should reflect the hp that you use 70% of the time. Not the hp you use less than 5% of the time.
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