I have recently replaced my cat-back exhaust and my old exhaust is up for sale now. I have priced it accordingly because it does need some TLC but it's still 100% functional and will give you HP gains. Here's the story behind it:
It's an Invidia Q300 full cat-back purchased in 2012 and it has about 43,000 miles on it. The car has been garage kept it's entire life and has seen very little salt/snow (if any) throughout it's life. That being said, it does show it's age. Here are the main points that you need to know:
1. The flanges where it bolts up to the cats have been modified to fit a 2.5" cat / test pipe. There were signs of an exhaust leak at this flange, not sure what the cause is because I've tried new gaskets and tightening it down myself. I have included a picture that shows the black carbon leaking out of the flange.
2. The flex pipes on the y-pipe will need replaced, or the entire y-pipe may be a better option. These are shown in pics as well.
3. You'll need new hardware such as gaskets, nuts and bolts. Actually you won't need new hardware for the X-pipe in the middle because I couldn't get those darn bolts off, so I decided to take it off as one piece along with the y-pipe. (I can provide what I have left over from the removal of the exhaust as well)
4. The Q300 mufflers have been replaced with custom twinloop mufflers to improve flow while keeping sound levels down. The Q300 mufflers are chambered mufflers so they were more restrictive than the replacements that I had put on.
5. I will not ship, local pickup only. I can meet you within a reasonable driving distance. I live in north Arkansas.
6. This exhaust fits G37 RWD Sedans. I don't know about AWD fitment.
As I said, the exhaust is perfectly functional as-is (if you have installation hardware) but there are some leaky points and it doesn't sound clean because of these leaks. Nevertheless, for this price, if you know a good shop, I would assume you can get this fixed for an all-in price around $500-600 total and have yourself a nice exhaust. Or just run it as a cheap carryover until you can afford a new, quality cat-back.
I can provide sound clips / videos as requested as well.
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