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It would help to know what you want from it ... how loud? What tone are you aiming for--lawnmower or a more refined noise? Maximum performance or balanced performance and comfort? Are you looking to do downpipes as well? Do you have a budget? Do you care about the aesthetics of the exhaust tips?


Plenty of fantastic options available through AMS Performance, Z1 Motorsports, Concept Z Performance, and even participating Infiniti Motorsports dealers.


I would guess the two most common exhaust upgrades for after the downipes are Infiniti Motorsports axle-back exhausts and Fast Intentions cat-back exhaust.
 

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I just installed the Infiniti Hemholtz axle back exhaust mentioned earlier in this thread. In my opinion, it sounds great. I'm very happy with it (my wife, not so much).

While I would have liked something with decibel levels that would peel the paint off my neighbors house, it was important I get something that wouldn't give me warranty problems if I took it in to the dealer for service. The dealers by me are not very cool and I need to make sure my mods are covert enough or manufacturer approved to avoid any issues. This is a genuine Infiniti product. You used to be able by it directly from the Infiniti Motorsports website, but I guess Ghosn must have taken that with him to Lebanon since the site's no longer up.

I think it's a very refined sound. Not too loud at idle or low revs, which is good if you're passing a cop, you can just coast by and he/she shouldn't cite you for noise. But once you put a little throttle into her, it screams and sounds great.

Best part was I could install it myself since it's just a bolt-on part. No welding required. Just 4 14mm bolts. Took me about an hour once I got the car is lifted.
 

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I would like more of arefined noise and a balanced performance. I've been looking into getting downpipes from Fast Intentions.
Refined sound with good performance and going with the Fast Intentions downpipes ... I would go with the Fast Intentions cat-back exhaust. I would recommend the resonated x-pipe with the Touring mufflers (14-inch). If you like your exhaust on the louder side, then pick the Sport mufflers (10-inch) to get a slightly louder sound than the Touring mufflers, which should be a little louder than OEM (noticeably louder with the downpipe upgrade). Definitely get the resonated x-pipe to minimize drone, especially on the highway.
 

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Would I need to buy a heat exchanger to go along with the exhaust?
A heat exchanger has nothing to do with your exhaust. It's for helping to keep your intake charge temp down. Better heat exchangers will mean you can make more pulls before your engine heat soaks.
 

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Discussion Starter #10
Might have seemed like a stupid question but the reason I asked is because I was a pros & cons video about full & lower downpipes. This is my first time modding a car so I want to make sure I do everything right and avoid problems. I appreciate you replying. Thanks!
 

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Might have seemed like a stupid question but the reason I asked is because I was a pros & cons video about full & lower downpipes. This is my first time modding a car so I want to make sure I do everything right and avoid problems. I appreciate you replying. Thanks!
IMO, lower downpies (AMS or Z1) coupled with Fast Intentions cat back exhaust (resonated or non resonated) non resonated will be a touch louder..and get the AMS heat exchanger and than maybe a tune the car would be a world of a difference from stock. I used to full full downpipes but the tuner couldn't control the boost spikes and caused me to over boost often so went back to lower down pipes and looking for a new tuner which will most likely be RT tuning in PA. Or Brandon (BT tuning) i have seen him giving people some major gains.
 

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After spending a lot of time on this forum and listening to all the input, I bought a Fast Intentions Touring resonated with downpipes. Installed this myself in about 3 hours, piece of cake because the parts actually fit!! Now this mod is worth about 43 hp and about the same tq. The power is nice and very noticeable. If I could change anything, I would make quieter. I know that is terrible, it's just me
 

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Here is something else I haven't heard much about. Lower downpipes removes the cat converter. What will Infiniti or your state emission inspection think of that removal?? I live in Arizona and I really don't know!
 

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Here is something else I haven't heard much about. Lower downpipes removes the cat converter. What will Infiniti or your state emission inspection think of that removal?? I live in Arizona and I really don't know!
These cars have 4 cats, the upper cats are the primary, the lower cats are the secondary. I dont know about your state but I think you would be okay with the lower DP to be honest.
 

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Here is something else I haven't heard much about. Lower downpipes removes the cat converter. What will Infiniti or your state emission inspection think of that removal?? I live in Arizona and I really don't know!
The lower downpipes replace the secondary converter. The only function of the secondary converter is to address cold start emissions, until the primary converter "lights-off"/becomes active. Otherwise, the secondary converter is "along for the ride" when the engine is operating in closed-loop mode. You can remove the secondary converter and will still pass OBD2 readiness, which is what most state emission stations check for. You will not get any check engine lights either with the removal of the secondary converter.

The only question would be how stringent is your state's visual inspection of emission equipment, if any. Most inspectors are looking for a primary converter, and if you pass OBD2 readiness, I doubt you fail otherwise.

The removal of the secondary converter will really help free up horsepower & torque, as it is quite a restriction in the exhaust.
 

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I have a takeda catback exhaust for sale if you're interested. Only had it on the car 2 months before I traded the car in for something else :(
 
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