nah not needed imo
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subaru upper engine cleaner works really good. i use it often.
FYI theres a guy on ebay that sells the cans by the box regularly. its about $7 per can.
i dunno if we're allowed to link it, but just type subaru upper engine cleaner in ebay :)
did this on the weekend aswell. car was idling a bit funny so thought i would give it a clean.
i simply took off my intake charge pipe
got my brother to hold the accelerator(car was off) opening the butterfly
and sprayed about a 1/3 a bottle of carby cleaner inside the TB.
i didnt do it while the car was on because it was too loud and didnt want the neighbours to complain again. they hate my car..
turned the car on and revved it at about 3500 untill the engine normalised then went for a spirited drive. fixed my idling problem and think my car is a little more responsive aswell.
ebay link
the guy sells it by the box, 12 bottle per box for 85 bucks.
I done this,works great!
Smoother ride now and a bit more pep!!
ive got heaps if anyone wants to buy in bulk - $10 per can - RRP $17