Larini back boxes - 3200

is it more complicated to fit this to a GS? Don't they have a valve which flips in sport mode? Not sure about the pipe endings compared to the ones on my GS.

I really don't know, I would have to defer to the GS experts on here

I hear its easy...will let Matt or Mark explain

Larini's are an easy fit for a GS. You need to buy the valved version of their boxes - these are made to fit with all OEM parts that will still operate the valves in Sport mode.

Here's mine to see what they look like:

Thanks, stunning car by the way!

Was it just an improvement in the noise or was there mpg improvements as well??

MAF250 is this you?? Can't be many yellow GS with a Larini mod.

https://www.youtube.com/watch?v=XEtHJ_GbPeA

hilts uk said:

MAF250 is this you?? Can't be many yellow GS with a Larini mod.

https://www.youtube.com/watch?v=XEtHJ_GbPeA

Click to expand...

Guilty. There are a few videos posted on that channel to demonstrate the sound but I don't think any of them do it real justice. Bear in mind that I've had more than the rear boxes changed - decat manifolds, Larini sports cats, Larini h-pipe as well as the valved rear boxes.

Skid1769 said:

Was it just an improvement in the noise or was there mpg improvements as well??

Click to expand...

Haha! No improvement in MPG but I've definitely seen an upside in MPH...

How much is the full kit? I assume this gets rid of the secondary cat as well?

hilts uk said:

How much is the full kit? I assume this gets rid of the secondary cat as well?

Click to expand...

Depends on which exhaust system your GS has got. Euro-spec has non-cat manifolds then 2 cats each side in the same pipe. US-spec has cats in the manifold then 1 cat in each pipe afterwards. I had US-spec and wanted to get rid of the OEM cats as they're prone to break up and particles can be sucked back into the engine. I bought OEM non-cat manifolds with Larini parts to suit - single 200 cell sports cat each side, h-pipe then into the valved rear boxes I already had fitted. Larini parts aren't cheap - from the manifold back you are looking at £5k-£6k plus fitting. The OEM manifolds are £4k from Eurospares. I bought mine used for a fraction of that, but that was a once in a lifetime deal! Changing the manifolds is also very time consuming as the engine has to be lifted off the mounts for clearance and the oil tank also has to be moved. Fitting the manifolds and new Larini parts was almost £1k in labout costs.

Have a read of the thread I started here for more detail:
http://www.sportsmaserati.com/showthread.php/13177-GranSport-exhaust-mods-picture-heavy-thread