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<img src=http://albums.photopoint.com/j/View?u=1650131&a=12890503&p=52747564&Sequence=0</img>
These are pipe sizes I found behind a muffler shop...NC did a little scavenging for his generator build yesterday...little did they know (actually they were getting rid of stuff).
3" Nothing Stock
2.5" Nothing Stock...this is your larger Truck Exhuast
2.25" Nothing Stock...This is your typical Truck Exhuast
2" This is your Domestic Larger engine or GM Exhuast
Comes on the V-6 Honda and Acura Models.
1.75" This is your typical Compact or Import Exhuast
Typical Honda Factory Exhuast
1.5" This is your average GEO or Econony or Efficiency Engine
This is your 88-91 CRX HF, 92-95 Civic DX Hatchback, 96-97 Civic HX Coupe.
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1.5" This is what you need to keep the engine running at those high gas mileage ratings if it comes with this exhuast...it is essential!
1.75" This exhuast works best with the 88-91 DX automatic models. I highly recommend staying with this exhuast piping size.
2" This exhuast size works best with the DX manual model for performance. Anything more and you should be spending money going to an Si MPFI manifold.
2.25" This exhuast size works great for everything. It's the best recommendation on anything.....Si, SOHC-VTEC, B-series everything.
2.5" I recommend this exhuast on the B20 and B21 Prelude, the CRV, and B-series engine with Stroker Kits...These exhuast only work good NA with A long stroke or a large piston. This exhuast works great on B-series and D-series engines when all bolt-ons and such are added to give the engines more torque and top-end to overcome the lack of torque feeling this exhuast will give. If your engine is stock or you will not be investing a lot, go with a 2.25" exhuast. This exhuast is also required for the Turbo Kits. If your are running anything less, then your first upgrade is the exhuast. You also have to add a straightpipe so you won't clog it up with carbon and cause excessive heat in the turbine.
3" Turbo only, not your stock standard D16Z6 Turbo Kit for the D-series, but upgraded Greddy Kits for the B-series. Upgrades as in downpipe size, higher capacity blowoff and wastegate, possible larger turbine, more boost, etc.
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Notice how I am conservative here in my opinions...and this is only because this is aimed at driveability. I would say plus-size by .25 inch if you want to run it hard and don't care for:
mellow low-end
AC really causing no power when driving around
lesser gas mileage
a mismatched, lesser pull feeling on the low-end, like it has no balls.
Now on the higher compression engines you won't feel this hardly at all, but the 9.1~9.4 CR engines you will.
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3" Turbo Exlusively Usually very free-flowing and never use make use of a catalytic converter
2.5" 6000 - 9000 rpm engine at best
Extremely Fast Throttle Response - no restriction
2.25" 4500 - 6500 rpm engine at best
Fast Throttle Response
2" 3000 - 5000 rpm engine at best
Throttle Response hardly has a lag
1.75" 2500 - 4200 rpm engine at best
Throttle Response lags and is slow and more smooth, Feels like there's a backpressure present, A bottled Exhuast feeling.
1.5" 2300 - 3800 rpm engine at best
Throttle Response Lag is a decade long, Completely no top-end. If an automatic, the engine has a bog in it before it catches back up with your foots position on pedal. a lot of backpressure and bottlenecking.
