Your thoughts and feedback – catless X-pipe with resonators (4)

happyg512 · 10-11-2012, 02:45 PM

I thought the post can help me form a better decision on the modifications I am thinking about.

First my goals are

To get to the same horsepower to weight ratio as the coupe (yeah I have a convertible)
If I go catless, I would like to be able to easily change and go back to stock (complete bolt-on, no cutting, welding or fabricating and I need to be able to use any 'cat-back' or rear muffler sections after the resonators) in case I need to do it for inspection.

Based on my calculations (assuming a 15% delta between CHP and WHP) I will need to aim for at 410 WHP and I would like to stay NA if possible.

The improvements I am currently thinking off are

Air filter (probably BMC race) – still need to check whether I have the restrictive stock filter.
Dynamic air scoops (either RPI, aFe, etc…)
Pulley (probably Macht Schnell)
Primary and secondary cat delete (either Borla X-Pipe with test pipes and 4 resonators, Dinan High Flow Middle Racing Exhaust or Gintani E9X M3 X Pipe)
Tune 93 Octane
In the future I might go with new mufflers (looking at weight savings; titanium, but this will be pricey); either Akrapovic Slip-On or Remus.

So my questions now are

Can I use the stock OEM muffler with all of the listed X-pipes?
Was someone able to do this complete bolt-on, no cutting, welding or fabricating and any 'cat-back' or rear muffler sections after the resonators?
If yes, would it be possible to get sound clips? – assuming nobody lives in the area so I can listen to these combinations.

Feedback and opinions are welcome.

Thanks for reading,
Guenther

Wolfinwolfsclothing · 10-11-2012, 03:49 PM

Honestly, for the price youre better off going with a supercharger especially if you intend on doing akra plus an x pipe which will easily tally 5K whereas you can do a new supercharger for ~8K.

happyg512 · 10-11-2012, 03:59 PM

Yes, thanks, I thought about this option too.
My main concern is my current understanding that superchargers are not street legal in California, so I am currently assuming that I will have a problem with inspection in Massachusetts as well. I think the regulations are the same.
So for me - changing the X-pipe and the tune to get an inspection is just a lot less work than with a supercharger.

drifts500 · 10-12-2012, 05:19 AM

You really care...about street legal tune in So Cal??

Catless X-pipe is not street legal. Tint is not legal in CA. Tune to 93 octane also..I believe...

For the exhaust..if you do not want to spend a lot of money..

Buy Macht Schnell test pipe ($500) and do OEM mod ($200)....

If you delete resonators, you would get raspy

happyg512 · 10-12-2012, 01:43 PM

You really care...about street legal tune in So Cal??
No, sorry my mistake for not providing enough details.

I am currently "trying" to use the Cal rules, because it is my impression - what passes inspection in Cal will also pass in MA. I am sorry I don't know the exact differences between MA and Cal, meaning what will not pass in Cal but will pass in MA. So I kind of go a safer route at the moment.

SflBimmer8484 · 10-12-2012, 02:53 PM

Bolt-on's are a great place to start when trying to unleash the maximum amount of Horsepower from your S65 engine. With our full Bolt on N/A system our customers have achieved excellent numbers (398 whp) above the stock (350 whp).

Our Kit consists of the following

AA- Axle Back Exhaust System
AA-X-Pipe Catless
AA-Power Pulley Kit
AA-Green Filter
AA- Tuning Software

atermechi · 10-12-2012, 02:56 PM

Quote:

Originally Posted by drifts500

You really care...about street legal tune in So Cal??

Catless X-pipe is not street legal. Tint is not legal in CA. Tune to 93 octane also..I believe...

For the exhaust..if you do not want to spend a lot of money..

Buy Macht Schnell test pipe ($500) and do OEM mod ($200)....

If you delete resonators, you would get raspy

have you done the OEM mod with the test pipe? I havent been able to find someone with this set up any were. please let me know

happyg512 · 10-12-2012, 03:02 PM

Have you done the OEM mod with the test pipe?
No I have not and I am not sure whether this is a good idea, because of the sound effects.
There is also a separate thread called “OEM mod + Catless” on this subject it think.

happyg512 · 10-12-2012, 03:03 PM

With our full Bolt on N/A system we got 398 Whp
That sounds great.

Could you also please be so kind and help me understand whether this will pass MA state inspection? I really would like to be sure before I make my decisions.

SflBimmer8484 · 10-12-2012, 03:12 PM

Quote:

Originally Posted by guentherkapp

With our full Bolt on N/A system we got 398 Whp
That sounds great.

Could you also please be so kind and help me understand whether this will pass MA state inspection? I really would like to be sure before I make my decisions.

You can and here is how!

Option A.We also have a special software to pass obdII testing with catless xpipes but this will not work if you have a sniffer test in your state.

Option B. Stubbies http://www.m3post.com/forums/showthr...rke+emmissions

10-11-2012, 02:45 PM	#1
happyg512 Enlisted Member 7 Rep 41 Posts Drives: E93 M3, E36 M3 Join Date: Feb 2011 Location: USA iTrader: (1)	Your thoughts and feedback – catless X-pipe with resonators (4) I thought the post can help me form a better decision on the modifications I am thinking about. First my goals are To get to the same horsepower to weight ratio as the coupe (yeah I have a convertible) If I go catless, I would like to be able to easily change and go back to stock (complete bolt-on, no cutting, welding or fabricating and I need to be able to use any 'cat-back' or rear muffler sections after the resonators) in case I need to do it for inspection. Based on my calculations (assuming a 15% delta between CHP and WHP) I will need to aim for at 410 WHP and I would like to stay NA if possible. The improvements I am currently thinking off are Air filter (probably BMC race) – still need to check whether I have the restrictive stock filter. Dynamic air scoops (either RPI, aFe, etc…) Pulley (probably Macht Schnell) Primary and secondary cat delete (either Borla X-Pipe with test pipes and 4 resonators, Dinan High Flow Middle Racing Exhaust or Gintani E9X M3 X Pipe) Tune 93 Octane In the future I might go with new mufflers (looking at weight savings; titanium, but this will be pricey); either Akrapovic Slip-On or Remus. So my questions now are Can I use the stock OEM muffler with all of the listed X-pipes? Was someone able to do this complete bolt-on, no cutting, welding or fabricating and any 'cat-back' or rear muffler sections after the resonators? If yes, would it be possible to get sound clips? – assuming nobody lives in the area so I can listen to these combinations. Feedback and opinions are welcome. Thanks for reading, Guenther
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10-11-2012, 03:49 PM	#2
Wolfinwolfsclothing Banned 37 Rep 1,312 Posts Drives: E92 ///M3 Coupe Join Date: Sep 2012 Location: B-roads iTrader: (2)	Honestly, for the price youre better off going with a supercharger especially if you intend on doing akra plus an x pipe which will easily tally 5K whereas you can do a new supercharger for ~8K.
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10-11-2012, 03:59 PM	#3
happyg512 Enlisted Member 7 Rep 41 Posts Drives: E93 M3, E36 M3 Join Date: Feb 2011 Location: USA iTrader: (1)	Yes, thanks, I thought about this option too. My main concern is my current understanding that superchargers are not street legal in California, so I am currently assuming that I will have a problem with inspection in Massachusetts as well. I think the regulations are the same. So for me - changing the X-pipe and the tune to get an inspection is just a lot less work than with a supercharger.
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10-12-2012, 05:19 AM	#4
drifts500 Private First Class 10 Rep 100 Posts Drives: e92 m3 Join Date: Nov 2006 Location: Seoul iTrader: (0)	You really care...about street legal tune in So Cal?? Catless X-pipe is not street legal. Tint is not legal in CA. Tune to 93 octane also..I believe... For the exhaust..if you do not want to spend a lot of money.. Buy Macht Schnell test pipe ($500) and do OEM mod ($200).... If you delete resonators, you would get raspy __________________ 09 e92 M3 Coupe TE37RT with Hankook R-S3 265/285 Techtec ECU Stock Exhaust
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10-12-2012, 01:43 PM	#5
happyg512 Enlisted Member 7 Rep 41 Posts Drives: E93 M3, E36 M3 Join Date: Feb 2011 Location: USA iTrader: (1)	You really care...about street legal tune in So Cal?? No, sorry my mistake for not providing enough details. I am currently "trying" to use the Cal rules, because it is my impression - what passes inspection in Cal will also pass in MA. I am sorry I don't know the exact differences between MA and Cal, meaning what will not pass in Cal but will pass in MA. So I kind of go a safer route at the moment.
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10-12-2012, 02:53 PM	#6
SflBimmer8484 Brigadier General 1467 Rep 3,157 Posts Drives: . Join Date: Dec 2011 Location: Florida iTrader: (5)	Bolt-on's are a great place to start when trying to unleash the maximum amount of Horsepower from your S65 engine. With our full Bolt on N/A system our customers have achieved excellent numbers (398 whp) above the stock (350 whp). Our Kit consists of the following AA- Axle Back Exhaust System AA-X-Pipe Catless AA-Power Pulley Kit AA-Green Filter AA- Tuning Software Last edited by SflBimmer8484; 10-12-2012 at 03:06 PM..
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10-12-2012, 03:02 PM	#8
happyg512 Enlisted Member 7 Rep 41 Posts Drives: E93 M3, E36 M3 Join Date: Feb 2011 Location: USA iTrader: (1)	Have you done the OEM mod with the test pipe? No I have not and I am not sure whether this is a good idea, because of the sound effects. There is also a separate thread called “OEM mod + Catless” on this subject it think.
	Appreciate 0 Quote

10-12-2012, 03:03 PM	#9
happyg512 Enlisted Member 7 Rep 41 Posts Drives: E93 M3, E36 M3 Join Date: Feb 2011 Location: USA iTrader: (1)	With our full Bolt on N/A system we got 398 Whp That sounds great. Could you also please be so kind and help me understand whether this will pass MA state inspection? I really would like to be sure before I make my decisions.
	Appreciate 0 Quote