d16 exhaust

[saikou27]

hey guys im just wondering what would work and FIT the best with a d16 . the headers have a 2.5" collector. the rest of the piping is 2" and i have a reducer for that. so should a 2.5" flexi pipe and 2.5" cat be installed aswell and then the reducer or the reducer straight out of the collector then a 2" flexi and 2" cat? cheers in advance guys. lemme know how u guys have set urs up

[simonnowis]

firstly, do you really wanna spend that much on a stock d16?
secondly, what goals do you have for your car? performance? more grunty sound?

a 2inch catback or even axle back with aftermarket muffler is enough.
you wont really be gaining any or little performance difference on an n/a d-series with bolt on mods.
2.5 you'll be losing low end power, and on a d-series whats the point when there isnt any real top end power, so a power loss overall.
i wouldnt go anything more than 2 1/4inch.

[jdm_b16a]

I'm using the standard exhaust manifold and downpipe, which is a split system down to one, then a flexpipe, and mandrel bend tubing. 2 1/4 is more than enough for this system. A nice flowing muffler will suit too. Sound quality is a matter of personal preference. But you don't want the system to drone or be too loud (and attract too much attention).

Peter

[EK1.6LCIV]

anymore than 2'' is a waste, I have after my 4-2-1 headers w/ a flexipipe modded to them then a s/s cat, resonator, then out to a cannon style muffler, it isnt overly loud, I just wanted to be able to hear something.

[saikou27]

the reason the headers are 2.5" is because i couldnt find any that were smaller. im not doing this for sound its all for performance. im not here to argue how much performance it will gain i just wanna know which method mentioned above will bolt up cleanly to the rest of the system better with less work

[EK1.6LCIV]

the exhaust shop will just fit up a reducer to the new line anyhow 2.5" to 2" etc

[saikou27]

the exhaust shop will just fit up a reducer to the new line anyhow 2.5" to 2" etc

thanks man:thumbsup:. but what i really mean is what sizes do i need to buy? i know the exhaust shop will fit a reducer but what i need to know is what size cat and flexi i need to buy because i dont know whether to reduce the pipe before the cat or after.

[EK1.6LCIV]

they'll offer u a size, best off having them supply, I mean it's very cheap for them to get it and sell it all to you with the labour as a deal

mine was 2" throughout, s/s cat rest was mild steel

[saikou27]

i considered that. but i found sourcing the parts myself turned out to be much cheaper. i go to my exhaust place often so he knows me and will give me a good deal just for labour. price isnt an issue. i just wanted some opinions on the setup i plan to run. thanks guys :D

[EK1.6LCIV]

for a basic setup I cant see how u sourcing the parts as an enduser without a trade discount will be any cheaper

I mean at most you would spend would be 500-600 in and out if the headers were already installed

[saikou27]

for a basic setup I cant see how u sourcing the parts as an enduser without a trade discount will be any cheaper

I mean at most you would spend would be 500-600 in and out if the headers were already installed

in total i save around $250 if i source the parts myself. its a combination of 2nd hand parts and new parts.

[simonnowis]

i considered that. but i found sourcing the parts myself turned out to be much cheaper. i go to my exhaust place often so he knows me and will give me a good deal just for labour. price isnt an issue. i just wanted some opinions on the setup i plan to run. thanks guys :D

opinions were given on your setup....its basically up to you what parts you want to put in.
since your set on sourcing the parts yourself it would be best to directly ask the exhaust shop when you go to install them since they will be doing all the labour work on it.

[SeverAMV]

problem with fitting a reducer is that it will change the fluid dynamics of your headers towards a more reversion based flow.

gases flow from regions of high pressure to regions of low pressure. 2 inch diamater pipe = region of high pressure, 2.5inch collector = region of comparatively lower pressure due to the higher volumetric capacity.

if you want to counter the effects of the reversion, you can have a 2 inch pipe going to a hot dog, and then a 2.25inch leaving the hotdog to create a minor anti reversion step.

[Limbo]

Yeah he's got a point on the headers.
But i think your original option will be fine as its not a high reving beast.

The last bit of 2" cat back will create enough back pressure and noise reduction.

[saikou27]

i found some better extractors. 2.25" collector on em. problem solved. thanks for the input guys :)