Hi Matt,

>If you need a 16V test car with MSDS headers let me know.

I will be in touch, THANKS!!!!

 

I am catless and RMB'd and it's nowhere near "NASCAR" loud. Alot of people at SITM said they liked the sound too. It doesn't even come close the the racket some of these open exhaust Chevy Silverados make around town. Other MY's may be different, but i am fine with how the 86.5's sound catless and RMB'd.

 

I'll make my observation very specific:

- 928 GT
- H test pipe in place of CATs
- GT resonators (smaller than S4)
- RMB

In this configuration a GT is NASCAR loud above 3k rpm.

It is possible - if not highly likely - that changing any of the above variables would result in non-NASCAR like sound e.g. non-GT resonators, non-GT cams, gutted CATs instead of a test pipe, etc.

Sterling Gee posted his experience of similarly NASCAR loud exhaust on his S4 with his CATless x-pipe, RMB, and monster motor.

YMMV. D.R.'s answer is the best one: Refund if you don't like it.

 

Nah, I'll just buy the cats and slip them inplace. Ordering Catless for now. And only for off-road and testing purposes of course

 

No cat or resonator on mine, just a borla XR-1 and 3" pipe.

Mine is NASCAR loud, but then, the XR-1 is a flat out racing muffler.

 

DR, i just talked to my buddy in NJ, he has a pre S, 82 i think, so i don't think that'll help you much.

Sorry bro.

 

Hi Rich,

> When my car was on the lift I noticed a small diameter pipe running down >next to the stock cats. I believe it attached to them.

Correct, that is the air tube from the air(smog) pump since the factory cats are designed to need fresh air pumped into them for them to work correctly.

>What will happen to that small pipe when my shop installs the new M-pipe?.

The cats we use do not require additonal air to function properly. As far the tube is concerned, you can plug and remove your Air pump belt , OR remove the air pump system completely which will drop some lbs from the car. Both options will also give you a few more ponys since the engine is not driving the air pump.

 

Hey Dave,

how long will the pre-order special last ?

Paul

 

Hi Paul,
>how long will the pre-order special last ?

For sure until we start shipping product. As always I will do my best to keep the pricing down and my manufacturer has agreed to freeze his estimated cost to me until then. I do not anticipate an increase, but nothing in life is guaranteed. To be honest this is a product I am very proud of and because I was not happy with what they ended up costing me I reduced my normal markup percentage dramatically to get it to the price it is now. I don't mind doing this for certain things like this because the enjoyment I get from coming out with product such as our Modular Crossover is worth much more to me than a normal profit markup would be. BUT, I assure you I ain't gonna sell them at a loss :-)

 

Hi Guys,

I have had a few private comments to me expressing confusion about dyno numbers that are posted here and elsewhere concerning other products similar to our Modular Crossover Pipe.

To be honest it confuses me also and I wish to try to make some of this a little clearer. Any comments and suggestions are welcome that will help you guys get a clearer understanding of these comparisons.

I hope I can do this without starting some sort of dyno battle as it is not my intention. I just feel it would be less confusing for everyone that if all details and parameters of dyno claims were posted along with the dyno numbers, instead of just dyno numbers.

One of the things I am confused about is I can't seem to find clear "A" to "A" dyno tests to compare to other systems. For example I have noticed some dyno charts pick out a specific RPM like 6k and use just that RPM range to publish dyno gains instead of simply stating Max Power period. PLUS, all of the "After" dyno results I see are on "modified" engines with chips and/or Adjustable Regulators and/or larger cat-back exhaust, and/or even aftermarket engine management systems as compared to a stock 928 dyno!. Heck some people just toss out a number and give you no other details. I will say that mine are with a Rear Muffler Bypass as it seems the majority of 32 valve 928s have one. BUT, in retrospect and in the future I will do it without even that.

In a sense of giving your guys more information to help you make an informed decision I have printed out another chart highlighting our gains at 6k rpm which seems to be the favorite RPMs used by a lot of people and that I have observed posted elsewhere. I will state for the record that I prefer "Max Hp/Torque" comparisons as indicated by the Dyno because I feel it is a more accurate representation and takes away the option of a vendor from picking the RPMs where you can show the most difference. It also eliminates the exploitation of the jagged uneven spiked lines that dynos output. There is no pattern of the "ying and yang" of these spikes so the differential can sometimes be very dramatic depending whether you are catching a dip in one spike at the same time as a peak in the other spike, or vice versa and this IMHO is very inaccurate for comparing products. BUT, just so you guys are getting all the information I will post both here. Again, this is on 90 GT with an RMB and a 100% stock unmodified engine (yes, even with stock Fuel Pressure regulators) and "ZIPPO" tuning prior to or during the dyno runs.

Here is the typed info as if can sometimes be hard to read the data on "shrunken" dyno charts.

All numbers are SAE corrected Rear Wheel HP/Torque AT 6000 RPMs

Factory Cats ------------------------ 257.31 HP, 225.24 Torque

Modular Crossover With Cats ----- 282.72 HP, 247.48 Torque

Modular Crossover without Cats -- 293.20 HP, 256.65 Torque


For the Modular Crossover With Cats that shows a Rear Wheel Gain of 25.41 HP and 22.24 Ft/lbs of Torque at 6000 RPM over the stock cats.

For the Modular Crossover Without Cats that shows a Rear Wheel Gain of 35.89 HP and 31.41 ft/lbs of Torque at 6000 RPM over the stock cats.

Hope this helps to answer the questions I have received.

 

Dave,
Put me on the with cats list please sir.
Andy Keel

 

Hi Andy,

>Put me on the with cats list please sir.

*#@&$&!^$#&@ CRAP, I was hoping I could trade you even for a Twin Screw Kit :-)

Thanks!

 

Ok Dave, I gotta' question this one. In your first post you had numbers from the same car using the same items which were a bit higher but showing much less gain. What's the story? Inquiring minds want to know........

I know from our X-over trials that a gain of 11 hp doesn't magically appear unless something has been changed. Same car, same components, same dyno, I'm confused.

 

he's picking a point on the graph (6000 rpm) as opposed to max hp for each setup which occurs at slightly different rpms. which is the best way to compare? beats me, but either way it gives a nice gain

 

Hi Dave,

Read the info carefully, one is Max HP and torque which the highest reading the dyno sees no matter what specific RPM. The second is a comparison of the HP and Torque at a specific RPM.

I learned this from looking at Louie Ott's charts on his website. For example If you go to the dyno chart for his X-pipe you will see Max HP/Torque readings in text below the chart that shows a gain of 9.5 hp on an 87 S4 with RMB and Autothority Chips before and after X-pipe install. BUT if you look over at his "cursor" position of 6000 RPM you see different differentials between the stock w/chips and X-pipe of approx 15hp. See http://performance928.com/cgi-bin/pa...ss_parent=1125

In a nutshell this is why I posted it both ways, if you look the Max Power info is still there in the upper left hand text of the dyno sheet even on the second graph.

The easiest and most accurate way to see the complete performance picture of 2 comparable products is to overlay the dyno charts and look at the gains all along the RPM range. Of course this can only be done if the dyno charts are posted, and then it is only even close to a real comparsion if it is on the same type unmodified 928s and even better if done on the same 928.

If you get the time please post your charts so some of these smart "whipper snappers" can do the overlays. Again of course this is only valid on stock UNmodified similar 928s.

In reality I am not trying to make the highest gaining product and am not interested in a HP/dyno war with anyone. I will gladly bow down to those that spend years tweaking and tweaking products. I am more interested in just the highest quality, innovative products that give great gains and more importantly repeatable great gains and are a true value for the $$.