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  #1  
Old 07-09-2011, 11:29 PM
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Default custom diablo tune?

I am running a y pipe delete, afe stage 2 intake and 93 octane tune. Is there any changes I can make as far as tuning to gain a few hp from the open pipes or to compensate for lessened back pressure?
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Old 07-10-2011, 12:32 AM
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You should still have plenty of backpressure from the stock manifold, cats, pinched crossover pipe, and the resonators. I would leave the custom tuning to a cmr dealer or one the well known tuners online like hemifevertunning.com. Also with the mods you have I would wait till you get more before sending the money on a good custom tune imho.
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Old 07-10-2011, 01:16 AM
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Alright, sounds good. Next I think I'm goin to a true dual, do you think that's worth it? They want 175 out the door to do it.
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Old 07-10-2011, 01:25 AM
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I agree RamTex. Once you need to get into the fuel delivery tables, the spark/knock retard features and such, that's best left to an authorized CMR tuner.

What kind of mufflers and pipe are they proposing with the dual system?
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Old 07-10-2011, 01:38 AM
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no mufflers, just a getting rid of the front y pipe and running straight pipes back to the resonators. would that be louder than what i've got because I like it right where it is. any power gains?
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Old 07-10-2011, 01:39 AM
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No...in fact with a straight pipe and nothing in between the exhaust manifolds and the resonators, you will more than likely lose some low end torque.
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Old 07-10-2011, 01:56 AM
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awesome, thanks man you just saved me 175 bucks, haha. I've heard high flow cats are also a waste, what about headers?
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Old 07-10-2011, 02:01 AM
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http://www.autoanything.com/exhausts...aspx?kc=ffprod
was thinking about these, would they bolt right up or would I have to get em pro installed?
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Old 07-10-2011, 02:04 AM
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Headers can help if you've done a higher duration and lift cam, done some head porting, etc...but for a stock engine, you really don't need them or higher flow cats. Just don't go too large on your exhaust. Believe it or not, you do need some restriction in the exhaust system to maintain backpressure.

What I would do is stick with the stock exhaust manifolds and cats, check your Y-pipe to make sure it isn't crimped or flattened (if so, replace it) and look at either doing a single in / dual out muffler with new tail pipes or go to a true dual system with mufflers.

Also, I am guessing you have already done an intake? Do you have a programmer yet? The combination of the exhaust intake and programmer makes a huge difference in performance.

Following that, it's time to get into the engine for head and cam work. And when you do, you'll be glad to have a programmer to be able to upload custom tunes.
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Old 07-10-2011, 02:17 AM
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yea I went from a 14" magnaflow to a flow 40 series then to the delete because I wanted more rumble. I've got afe stage 2 and diablo sport tuner runnin a 93 octane can tune. what could I do for more power without voiding my warranty?
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