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Old 08-28-2012, 09:49 PM   #1
fastwrxlvr
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Default what will happen if

What will happen if i run stage 2 with just a muffler and resonator delete? call it a noob question if you want but in my opinion a noob move would be to do it without knowing what the negative effects are so thats why i am asking.
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Old 08-28-2012, 10:18 PM   #2
freddy121389
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im lost, are you running a a/m downpipe already and just want to know if you remove your quiet parts on your exhaust will stage 2 still work?
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Old 08-29-2012, 12:40 AM   #3
baldsincebirth
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I'm still new at this too, but my understanding is that to run stage 2 maps you MUST replace the stock DP. The muffler and resonator really don't make much of a difference in anything. The stock downpipe is what constricts the flow and needs to be replaced with one that is more efficient in order to run stage 2 maps.

I think on the older models most people say you should replace your uppipe too because the ceramic in the cat can get dislodged and destroy your turbo when running higher boost.
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Old 08-29-2012, 08:25 AM   #4
Cobb Tuning
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Quote:
Originally Posted by fastwrxlvr View Post
What will happen if i run stage 2 with just a muffler and resonator delete? call it a noob question if you want but in my opinion a noob move would be to do it without knowing what the negative effects are so thats why i am asking.
Hi there. A stage 2 map requires an aftermarket downpipe. Running the stock downpipe, regardless of any changes to the catback section of the exhaust, will require the stage 1 map. Running a stage 2 map in that case could cause problems in that case (and will not be optimal for power and driveability).

Bill
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Old 08-30-2012, 04:52 PM   #5
fastwrxlvr
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i only have a muffler delete and a resonator delete, i understand that you are stuppose to have turbo back exhaust and or a catless downpipe, my question is what will or could happen specifically, like excess back pressure, loss of power,....?
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Old 08-30-2012, 04:58 PM   #6
fastwrxlvr
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well i think i might have found the answer, i saw a question very similar to mine on iwsti, and they said because the stage 2 map is tuned for a more free flowing exhaust system, stage 2 on stock will cause high temps under boost and cause the car to run very rich. is that the case?
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Old 08-30-2012, 10:58 PM   #7
DabiDa
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So you are trying to run stage 2 but not have supporting mods?? If you want to do stage 2 you need a downpipe cat or cat less most do cat less as it is cheaper also highly recommend you do the upipe aswell.
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Old 08-31-2012, 08:28 AM   #8
bacalhau16
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I believe your asking and want to know the WHY. You can't run a stage 2 tune with a stock Downpipe because its a different map all together. It has nothing to do with the exhaust itself at all. you are only confusing yourself and everyone else when you keep mentioning it.
Im not sure if it would be richer or leaner, could go either way i suppose. Just know its bad and doesn't make any sense to do.
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Old 08-31-2012, 09:08 AM   #9
Cobb Tuning
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The tune on a particular map is designed to work with specific modifications, whether that is a primarily stock car with stock or aftermarket catback (stage 1) or a car with an aftermarket downpipe with stock or aftermarket catback (stage 2). There are other considerations such as what intake is compatible with the map in question. For our OTS maps, you can go to the maps section at cobbtuning.com and download the map notes for any given map (or set of maps) and see what mods are required and what mods are outside the scope of the map.

Running a map that is designed for mods that you don't have will most likely cause you to lose power/driveability and potentially cause engine damage, depending on how far off that map is from what you actually need for your given engine mods. Running a stage 2 map on a stage 1 car has no benefit whatsoever - you will likely underboost and make less power. Bottom line is - always use the proper map with the correct corresponding mods for the best power, driveability and engine safety.

Bill
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