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Discussion Starter #1
I have a 2011 wrx hatch, as of now it is straight piped intro duals with 3" pipe from the downpipe back. The car came with SPT Cat-back exhaust.

I was wondering what would make better numbers with a tune, keeping it straight piped or putting the SPT exhaust back on. Any Help?
 

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How does you straight pipe look after the axle? Does it have dual exit? I had a shop do a axle back muffler delete on my hatch and it has a little bit of a whistle to it when I get in to boost. I hate it and would like to see how other peoples hatches are configured.
 

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Having the least exhaust flow restriction. In this case, straight-pipe.

Personally, I would just opt for a regular 3" catback over the SP option.
 

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Captain James of the SS Impreza has gone down with
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Having the least exhaust flow restriction. In this case, straight-pipe.

Personally, I would just opt for a regular 3" catback over the SP option.
Yes.
 

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If you're looking for more power, the choice of catback shouldn't be your primary concern. I assume you're considering a protune? If so, you need a DP, EBCS, and new intercooler. A protune just won't be worth the money right now.
 

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A protune just won't be worth the money right now.
This. If you're gonna get a tune, may as well at least go Stage 2 with a DP...
 

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Captain James of the SS Impreza has gone down with
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This. If you're gonna get a tune, may as well at least go Stage 2 with a DP...
Coming from you...you aren't even stage 2 son! :rotfl: You need to get on that btw.
 

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I don't know if you can see it but this is how mine looks. But sitting still it doesn't whistle. You can here the turbo some but not much but its when you get on it while your moving that is sounds like its spinning the tires that kind of whistle. I talked to some people and they say to get a sedan mid pipe and do a y before the rear axle and then the exhaust isn't restricted
 

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That's what need to do thanks. I was going to have them do it that way but I wanted to be able to bolt the stock muffler one if I needed
 

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Coming from you...you aren't even stage 2 son! :rotfl: You need to get on that btw.
yeah good point...I'm just waiting on an install day with my buddy Ricky...one of these weekends coming up haha.


OP, that straight pipe looks good. I imagine it sounds similar to just throwing on the Nameless Axleback muffler deletes.
 

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Okay, so now you're loud. I thought you wanted moar power?
 

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Discussion Starter #16
That's what I was asking.. what would I make more power with, my 3" straight pipes or my SPT catback that came on the car when i bought it.
 

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That's what I was asking.. what would I make more power with, my 3" straight pipes or my SPT catback that came on the car when i bought it.
Sorry, maybe we need to better understand your end goal. Your choice of catback will have very little, if any, impact on gains unless you are doing a major build and start going for big numbers.
 

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What you really need to do is focus on the downpipe. That is where the most difference is going to be seen unless you are going for big numbers. Get a dp, intake, and maybe ebcs and then get tuned. A bigger top mount will help too but I'm not sure how much because mine is never really hot even after I get on it.

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