I put on 2inch and extractors But I building a worked A14 I think 2inch was silly for standard Tried A12. Still sound great

Yes 8% is a huge HP gain and if you can get that much from exhaust it would be totally worth the loudness.

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By contrast going from 9:1 compression to 11:1 is only worth 6%.

Take the fan off too. Chuck an electric one on. Fan will normally suck about 3 - 4 horsepower.

Rip the head off it and plane 70 thou off it. You can get a good gain from lifting the compression ratio. If you want to get real clever take 70 thou off one side of the head (plane it on an angle) This changes the flow from the inlet valves into the combustion chamber and you will get some more gain. Advance the cam by 7 deg also. You will have to re jet the carb but. chuck some dellortos or webbers on it. Simple mods to an A12 to get a good gain.

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Agreed. I originally put a hot dog on my stocker but after a bit of cruising, I had it taken off and the system taken back to stock.

Big exhaust is great off the lights and around suburban roundabouts but a real pain in the ears cruising along country roads at 80kph - especially if you also enjoy a good audio setup in the car like I do.

I also find a stock motor works best this way - they actually seem to like a bit of back pressure on the exhaust. Sure you might get another 8% at the wheels with a big exhaust on acceleration but ask yourself if it's really worth wrecking your ears for? For me, that pedal is only ever either off or flat on the floor anyway so whats the difference...

Is that some kind of british octane booster?

factory exhaust for stock engine is best
extractors only upgrade noise

best exhaust upgrade is for



you can banana exhaust turbo for cheap too

Used extractors $75 to $125
Used Weber 32/36 carburetor $100
Adapter plate new $65
Electronic Ignition kit $65 to $100

Probably your cheapest options for more power. But this won't get you as much power as an A14 or A15.

All the above can also be installed on A14/A15 too.

Otherwise any significant power modifications other than a cheap turbocharger setup are pretty costly on an A series.

Build yourself a draw through turbo setup.

Thanks what's the cheapest thing to do to the engine to get a noticeable power increase ?