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Header & Exhaust group buy

4670 Views 35 Replies 10 Participants Last post by  leadfoot_mf
My car has been at Fabspeed ( being used as a template for a new exhaust system. They already manufactor a Tubi like system that replaces the rear mufflers and increases the growl. If you look at the entire system though, you'll see there's a center resonator, infront of that a set of secondary cars (not required in the US for emissions since they are AFTER the second set of O2 sensors), and a bend in the pipe that pretty much flattens it out completely.

The new system sounds amazing and looks great. The clearances are no issue and it looks like the flattened out pipe is just the factorys way of being extremely conservative clearance wise.

Fabspeed also has a complete system from a warranty car from headers back that they've been experimenting with.

Car goes to the dyno tomorrow and after any needed tweaks, will go into production.

Rear mufflers w/SS tips: $1495

Center Resonator bypass kit (set-up still with an "x-pipe" design): $1000

Secondary CAT bypass pipes, $1890

All pieces are polished SS and drop in fitments, none of the above void warranty

All three can be used individually to tune the sound to your liking or order all three togeter and get a $300 discount or free local installation in the Philadelphia area.

If there are 5 or more people interested, there are 2 options for new headers as well (count me as #1 in line). This might or might not affect the warranty depending on your dealer and the problem since you're replacing the CAT. Car is still emissions legal and guaranteed no check engine light issues

opt 1. Take existing system, replace 600 cell count CAT with 200 cell count CAT and clean up some of the welds and bends (there's a 90 deg. bend in there!). $2000

opt 2. Complete new header with F1 style collector and 200 cell count CAT. $4000.

I will post pictures in a few days but while they have the car, wanted to see how many might be interested in headers, so if you are (or any of the other pieces), please PM me and I'll start a list for the group buy. 5 or more people upfront they'll knock 15% off the headers. 10 or more people and they'll knock 20% off

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Any Updates on this? Pictures?

I would like to remove the crimp and replace the 2nd set of cats with a bypass.

Please let us know about dyno results. I dont want to loose torque in the process.
Did you ever take your car to the dyno? I would be interested in knowing the results.
It seems like the ever elusive dyno #s never seems to appear to back
the product.

What is the cost to run a dyno test? Is it safe to do so? I would think you would need to go to someone very familiar with the maserati engine right?

I have seen some tests on utube where the motor "pops" but those were heavily modified cars.

If it is a matter of reving the motor for a moment or two to the redline, I'll just do it myself.
I had mine dyno'd a couple of times now. I would assume those engine block explosions are likely caused by chargers. If I remember correctly, i paid $75 @ D2 in Gardena.
rather tunning experts would do need not a maserati specific specialist.
Engine has to be pushed just right for the test to be accurate.
I can't believe you just said $75.00
Thats all that it takes to validate a performance product and I have yet to see anything either on this board or the well known ferrari boards. Thats kind of funny. There are page long debates about backpressure, hp, torque etc from exhaust mods all of which can be resolved with about $200. of testing

Well, I have to ask: Have you had your car dyno tested after any modifications to exhaust?

I'd like to find someone to test my car in the west la area if possible. If anyone knows of a good shop, I'll do it, and again after any mods to the exhaust. I know FX performance may be a starting point, but I think they
are now into general repair.

Also, I had some tire damage this past week from a pothole, so while they had my car up on the rack, I took a good look at that bend in the pipe.
Its pretty flat. Almost looks like its crimped.
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i think it was $75...even if it was $150 I would still do it :D And i just remembered the name wasn't D2 (that's a BMW tuneshop).

It depends on what kind of dyno testing you want to do. Some things to consider:

-On newer cars both sets of wheels are being monitored by the PCM/ECU, so both pairs need to be rotating at the same rates.
-Be very careful of inadequate cooling of the engines and tires during testing.

If you are looking at just getting peak torque and HP numbers on a non-load bearing Dynojet, you can call R&D Dyno in Gardena. Their phone number is 310-516-1003. The owners name is Darin. His address is 115 East Gardena Blvd. (which is east of the 110 freeway) in Gardena. Non-load dynos tend to inflate their numbers over load dynos.

If you are looking at doing load testing and duration testing you need to contact Westech in Mira Loma their web site is They both specialize in dyno tuning and diagnostics and own a true load bearing dyno from Mustang. This is a two wheel dyno. Contacts at Westech are Rick Stoner or John Baechtel at 909-685-4767. Their address is 11098 Ventura Drive , unit C in Mira Loma CA 91752.

as far as west la goes...there is one in culver city near robertson...though I wouldn't go back again.

now, about my dyno results... R&D did the before, too lazy to go back I went to the "culver" one for the after. since the two tests were done on completely different machines, they were then inconclusive. went back to R&D after the Eurotek ECU mod and the number was about the same as the 5 bhp more or something. after the ECU disasters I never did any mods again. there is only so much they can do and they make you believe the mods can turn these babies into rockets (only if they are rocket scientists). turbo and super chargers are different story though, an entire diff. realm of mods. focus on suspension and weight than getting more torque or bhp. unless you mod the entire engine compartment there is very little gain you can get for 5-10K.

hopefully Eurodino can hook me up with his rocket scientist friends one of these days :D

Thanks for the information. So basically, I pull the crimp out of the exhaust and get about 1 extra hp.
Wouldn't the dyno shop monitor cooling temp and tire temp during testing? how long is the process? westechperformance indicated a day of testing. Seems like that would be pretty harsh on the engine with no air flowing.

I would be curious to know what the specs are on the Trofero as they are at 425hp and supposedly only slightly modified from the production engines.
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