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You okay with using the automatic A71? They come up on eBay fairly regularly from salvage yards going for between $150 and $200. Sometimes they'll include the immobilizer and a key for the car which could be helpful if you do run into problems but that's usually adds about another $100 to the asking price.

If you're dead set on a21 manual ECU You're going to pay about three times as much and they're pretty difficult to track down.
 

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You okay with using the automatic A71? They come up on eBay fairly regularly from salvage yards going for between $150 and $200. Sometimes they'll include the immobilizer and a key for the car which could be helpful if you do run into problems but that's usually adds about another $100 to the asking price.

If you're dead set on a21 manual ECU You're going to pay about three times as much and they're pretty difficult to track down.
Is it bad to use an auto ecu?
 

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2005 Acura TSX 6spd
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Is it bad to use an auto ecu?
no it is not, the only con to the A/T ECU is that the reverse lockout doesn't work. There is mention of this on HeelToeAuto

*Note that the use of an automatic ECU in a manual TSX will eliminate the function of the reverse-lockout solenoid, which is a part that keeps the shifter out of the reverse gate when you are moving forward. It is possible to move the shifter into the reverse gate while driving, so care should be taken when shifting into 5th or 6th gear. Heeltoe has tested this product in the HTSpecTSX and found no harm to come from moving the shifter into the reverse gate while driving, and it is not possible to accidentally engage reverse.
Source

I found a local pick and pull that had just gotten an 08 TSX (via Craigslist), it was A/T but I went and grabbed the ECU - only $33!
 

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HTSpecTSX and found no harm to come from moving the shifter into the reverse gate while driving, and it is not possible to accidentally engage reverse.
Wait, what exactly does that mean? You can put it into the reverse gate but if you let off the clutch it won't engage? how is that possible?
 
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