Hi

I'm in the process of choosing the type of exhaust, either a true dual or single 3" midpipe (so same as stock with dual tip exit except freer flowing 3" centre mid pipe) and then getting an uprev map to finish it all of. However I do not want to lose low end torque and have heard this can happen with a true dual (due to back pressure issues) so the alternative is I go for a single 3" midpipe (not single exit just normal dual tip exit but larger single 3" midpipe).

I have already done a lot of searching on this issue but not found any definitive info so if anyone has any personal experience from trying a true dual and found good or bad results please let me know. I don't want to know what the "best" exhaust is because this will have been answered many times but just interested to know personal experience from people regarding low end torque whether they lost any with any type of exhaust, single midpipe or true dual.

Also does anyone know what the stock bore diameter is of the exhaust midpipe, is it 2.25" or 2.5" as I cannot find this any where even on Google?

Thanks for any info and help.

 

https://my350z.com/forum/intake-exhaust/261870-intake-exhaust-rules-faq-you-must-read-before-posting-updated-5-21-07-a.html

https://my350z.com/forum/intake-exha...aders-etc.html

 

You might check with Motordyne since they make both and Tony is obsessive about dyno comparisons. He could probably give you a quick and dirty answer. Keep in mind that every configuration is going to respond a bit differently.

 

Thanks for the links although I can't find info re the low end torque issue interesting opinions though re best exhausts etc. Thanks dhays I really like the quality of the Motordyne exhausts. I know they do a single centre midpipe exhaust but it also has a single exit. Only personally interested in dual exit exhausts. Tony, if you're reading this do have any info regarding the low end torque issue re single centre midpipe compared to true dual set ups?

 

Here you go.

This is a good one. Let everyone know of these details.
https://my350z.com/forum/intake-exha...k-for-n-a.html
^This one should be stickyed.

https://my350z.com/forum/intake-exha...ve-it-too.html
<o></o>

 

It should be stickied. Actually, your explanations should be reposted, stickied, and locked. That would make it easier to find, easier to use, and help reduce the number of questions that we keep asking repeatedly.

 

What do you think Dave?

 

Thanks Tony. Very good posts indeed. I agree should be made "sticky". Really interesting about the tests you did on pipe diameter and the use of a diffuser.

I know you do single pipes with single exits. Do you do single pipes with dual exits (so effectively look like the stock set up)?

You refer to your single pipe options in your second post (https://my350z.com/forum/intake-exha...-it-too-2.html) as:
Singles:
ShockWave single w/diffuser Y-back
Gamma Ti single Y-back
Harakiri Ti single Y-back

Do any of these three single pipe versions offer the option of having dual exits like the stock system or would this adversely affect performance? Your exhausts do look top quality and the sound I have heard from them is so unique. One final question do you ship to the UK?!

Edit: I have just looked on your site and found you do a VQ Exhaust which looks like a single midpipe with rear muffler and dual exits but it says it is axle back - so I assume there would be something connecting it to the Y-pipe which are listed on your exhaust components page? By the looks of it and the proven gains the Shockwave Dual Titanium is the best system for me - power wise and I personally love the sound it makes. Is the VQ Exhaust system going to make slightly less power than your dual Shockwave system?

On your exhausts components page (http://motordyneengineering.com/350Z...components.php) is the product "XYZ resonator" a resonated decat pipe and you would need two of them to connect to the other end of the Y-pipe? And is your "XYZ Straight Pipe" a normal un-resontated decat pipe, and again you would need two to connect to the Y-pipe? Very good prices. Sorry for all the questions.

 

The ShockWave))) dual, Gamma dual and Harakiri dual Ti are all single at the Y pipe outlet and go dual just before the rear axle. So yes, they do meet that criteria.
http://www.youtube.com/watch?v=omUjZUw9Gj0

The VQ exhaust is a Y-back system and will need to be connected to a Y pipe or XYZ pipe. The VQ exhaust wont really make much of a difference in power for most NA applications. Its not until you move into FI or a NA build that it would make a notable difference either. What is good about that system is that it is really easy to switch out the axleback muffler and replace it with the ShockWave))) diffuser. This will completely change the sound and reduce the weight. Being able to switch from one to another is a very nice option to have.

Also, when you order any one of the various XYZ pipes on the exhaust page, it comes with everything you need. You don't need to connect anything else to it and it will bolt right up to the VQ system.

EDIT: And yes, we ship to the UK all the time.

 

Thanks for the reply Tony. Useful info there. I absolutely love the sound of the Shockwave Dual Ti as in the attached clip. Does the Shockwave Dual Ti (true dual system) also include your XYZ pipe?

 

stop asking DA questions that u can answer urself by searching

 

Yes it does

 

Thanks for your help Erik. I appreciate your help. Thank you also 2004Black350z for your "contribution". I have done a lot of searching on this issue already. Either way I have firmly made my mind up and am going to get the Dual Shockwave Ti system. It sounds amazing and the quality first rate and power gains well proven. Only decision or question (for myself to answer) I have remaining is whether to go for resonated test pipes too or whether that will be too loud. If anyone has experience with or without stock cats please let me know. Before anyone asks, I've already done extensive searching on Youtube for sound clips of the MD dual shockwave Ti with and without cats and can find a few definitely with resonated test pipes but none definitely with stock cats so need to know how much quieter it may be.

Anyway thanks Tony and the guys so far for your replies.