I am planning to put midpipe and downpipe without tune on my stock gtr. I want to know how much power gain just installing dp without tune. I am also wondering if I need to put catted dp because I really don't want to have any problem with Nissan for warranty issue
Dp without tune?
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It may be cheaper, and you might gain as much or more HP buying a Cobb and using the available Maps. And then, if you go ahead with the mods you mentioned, you could re-tune for best advantage.
I believe that you can put a mid-pipe on and not affect any warranty issue. (maybe gain 5-10 HP without a tune; my guess)
Alexd
Anytime you mess with the downpipes, you will probably have a warranty issue with Nissan. Also, adding a downpipe without a tune will not give a significant amount of HP that you will notice, I agree with the above post 5-10 HP (not WHP). To maximize your downpipe and midpipe combo, you'll need a tune (Cobb AccessPORT).
Good luck.
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I would add that DPs without cats may cause fault-errors from the O2 sensors; something that might require re-flashing/re-setting anyway. Not to mention that if you have no cats in the DPs and midpipe, you'll fail exhaust-pipe pollution testing, and you may be unhappy with the additional smell.
A tune alone without any other mod will give you a noticeable power increase; perhaps as much 40 HP or so.
Alexd
A tune alone without any other mod will give you a noticeable power increase; perhaps as much 40 HP or so.
Alexd
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This.
As others mentioned - if you want to avoid warranty issues, leave EVERYTHING in front of the sensors alone - this includes DP's (because the last set of sensors is here).
I think I will go with midpipe only for now. I am not ready to give up my warranty yet lol. Maybe next year..
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