GDay guys Im at the stage of doing a bit of research for my new exhaust, to paint the picture, im looking getting a new exhaust from extractors back in my non turbo and looking into the best options. The things ive been throwing into the mix; Magnaflow mufflers Center muffler X Pipe Metal Cats Hotdogs (smaller mufflers) Option A -2.5", metal cats and magnaflow mufflers. Two of each all seperate. This keeps both exhausts separate and restriction to a minimum. I think this will prove to be over the top loud so the second option. Is this going to be TOOO loud? Option B -2.5", Hotdogs, metal cats and magnalow mufflers. Two of each all seperate. -Will the hotdogs make it sound stupid or will it be ok? Option C -2.5", X pipe, Metal cats and magnaflow mufflers. This will quieten it down slightly but increase pressure i believe. So im asking for peoples opinions on what i should be aiming for without being too illegally loud for the best power gain. All thoughts welcome. Cheers Steve
i've been interested on going down the two separated exhausts route, but i've heard this can affect the balance from each cylinder bank? Not sure if there's any research to suggest this will affect the engine greatly, but you'd think the most unrestricted passage was best ay. I have twin 3 exhausts as you know, with a h pipe and 'normal' mufflers (oval bodies with single tips). Not sure how much louder the hotdog ones are but if my car is anything to go off, hopefully not much i'll be interested to know what route you go down, keep us posted
Steve, My exhaust has extractors, 4 hot dogs, 2 cats and 2 mufflers (not straight through) on 2.5" system. It is quite loud and wouldn't want it to be any louder. I would suggest go as straight through as possible. Get 2 cats, X-pipe, 2 hot dogs, 2 magnaflows would be awesome :zlove: Cheers Rob
Hrm If theres nothing Negative about Not running a balance pipe then i might do 2 cats, 2 hotdogs and 2 muffs. Or alternative use 2 center mufflers. Whats a good brand hotdog or center muffler?
I think I saw someone say 2.25" is best for NA's? In any case, I'm fairly sure you want the x-pipe if you can afford it. I've never seen anything to suggest a negative, at worst I've seen "it doesn't make a difference" at best a hp increase. By extractors back, did you mean you already have extracters? Or you're going to get? What sort are you looking at? I think there's a couple of designs for them too, but I haven't really looking into it.
Ive alredy got extractors.. however on a stock exhaust with aftermarket mufflers. Its pretty loud as it is. I have the TTZ stillen copies i believe. If i could find better ones at a good price ill get them. Im waitin to see how the PZP ones turn out.
I'm running stock headers and everything back from the headers is 2.5inch: front pipes, metalcats in 2.5 (get in on the GB.. they're worth it), then i've got an off the shelf cat-back that came with the car from Japan (i think it's Fujitsubo...). It's 2.5 with a H-pipe and resonators (hot dogs) and oval body mufflers with 3.5 inch tips... I think my car sounds good but it's very loud. Has a nice bark to it though. I reckon you should go for custom front pipes in 2.5 and then 2.5 metalcats. Then go for 2.5 inch with the UAS X-pipe/resonator because that will keep it abit quiter and then go for oval body mufflers (magnaflows).
You're forgetting, Simon, that with identical aftermarket exhausts, NA's tend to be a bit louder than TT's because they don't have the quieting effect of the turbos. Also, the smaller diameter pipes that are required in order to keep some back-pressure in the system cause the NA to have a sharper, some would say "crackley", sound. Hence the hotdogs or center muffler after the cats.
my advice take it from someone who has had numerous exhaust changes over the years... ie, me.. If you dont have some sort of Hpipe (stock setup) or X-pipe joining the two exhaust, the NA exhaust will sound terrible. It will be extremeley loud, and the resonance is just shocking. Trust me, I know. What ever you decide in brand name is up to. Just make sure its quality stuff. But I would recommend the following setup: 2.5 inch front pipes (from headers, to CATs). Good quality CATS A good set of quality stainless steel mufflers after the CATS. 2.5 inch pipes from the CATS back. End the exhaust with some good quality stainless steel mufflers and exhaust tips. I currently have hotdogs in my car and am looking forward to replacing them as they just dont effectively quiet the exhaust as good as a pair of good quality oval mufflers. Also, be aware that the stock NA exhaust system (factory exhaust) is already at 88 decibel. The legal limit is 90 decibel. So it does not leave much room for error. Be aware that any changes you do, especially if you do what I have suggested above, will put you over the 90 decibel limit and technically make it illegal. But this is the price you pay for a performance exhaust. Cheers
100% agree with jedi x-pipe sounds better than h-pipe, (had both), my setup was extractors 2.5" front pipes metalcat cats UAS X-pipe resonator 2.5" cat back Magnaflow rear that was quite loud, and if i kept the car i was considering either some hotdogs, but apparently they do very little on NA Z's. or some extremely expensive, not straight through rear mufflers which would have quietened it dramatically.
I would if I were you... I mean, the stock exhaust is already 2.25 inch, so why do all that work and not change the diameter of the pipes when compared to stock. 2.5 inch is the max I would go on an NA. Cheers
Yeah it was always going to be 2.5, no talk of 2.25. Center mufflers and rear mufflers with an x pipe ah
I have completely separate..... exhausts for the left & right side! Mark at Exhaust Technology in Adelaide built the system for me! Cat back, 2.5" mandrel bent, it has in-line resonators or mufflers (sorry I don't remember exactly what he fitted??) just after the cats & JunBL cannons at the back!! No X or H pipes to be seen!! Many people comment on the 'sound' of the car! Once I fit extractors, front pipes & my Metalcats this will obviously have an effect.......hopefully for the better!!! & hopefully not too loud?? but the exhaust must be doing something right??.......put me at No.6 on the dyno list with everything else stock!!!
Ive already got those numbers and havnt touched the exhaust after the extractors But everything else stock i cant say your doing well.
Not exactly sure what your point is???? I would hope you'd be making good dyno figures if you have already fitted aftermarket extractors???..... plus didn't you get your engine re-built recently??? I think 136RWKW for my car with it's original stock standard engine & ONLY a new cat back exhaust is doing OK for a 16yr old car??? I'm looking forward to what figures she'll get once I fit aftermarket extractors, an underdrive pulley, hi-flow Metalcats, lightweight fly wheel & then get her re-tuned with the Unichip installed!!! Look forward to seeing your car on the dyno list if it's doing so well already???
I think ill choose hotdogs, metal cats, x pipe and magnaflow cats. That seems to be the go. Extractors on a stock exhaust dont do much.. where can they flow??
lol,how many sets of cats r u putting on ,im hoping you mean magnaflow mufflers :banned: :banned: seems interesting to me that when jedi says the hotdogs do stuff all hes taking them off ,you go the opposite and put them on ??? remember ,he has been there,done that !!!!!!!!!
