MY09 4GEN GT-B Auto - Most Cost Effective Upgrades?

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MY09 4GEN GT-B Auto - Most Cost Effective Upgrades?

Postby newbie_liberty » Thu Jan 05, 2023 9:58 pm

Besides a K&N panel filter from a previous owner, it's a completely bone stock car. It's so quiet that I even hear any squeaks or rattles....!

Want to get it sounding a bit better (boxer rumble and some turbo woosh noise) and maybe extract a bit more performance out of it.

Is a tune worth it on the stock turbo?

I'm planning on getting an Xforce 3" catback exhaust, but is there any significant power benefit to going with a turbo back system instead?

Will be keeping the car for a year at most, so have set a budget of $2k max for mods.
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Re: MY09 4GEN GT-B Auto - Most Cost Effective Upgrades?

Postby Yowie » Fri Jan 06, 2023 8:31 am

Welcome. Good pickup too.

Is a tune worth it on the stock turbo?


Yes, but do it straight after you install the other breathing modifications.


I'm planning on getting an Xforce 3" catback exhaust, but is there any significant power benefit to going with a turbo back system instead?


The power benefit comes from the forward section (dump pipe to cat). The iconic/better sounds come from the cat-back section. If your budget does not permit a tune, just get the cat-back section. If you want a power increase, go the full exhaust (or even a larger front section adapted to stock cat-back) AND get a tune.

...sounding a bit better (boxer rumble and some turbo woosh noise)


For intake noises some people go for a so-called "cold air intake". Design and quality vary. A lot of them turn out to be a hot-air-sucking pod filter in the engine bay. With the stock turbo you will not be making any more power, but the intake sounds will be louder. Almost certainly requires a tune after installing. Probably the worst "bang for buck" modification in my opinion [*braces for incoming disagreement from others*].

A much cheaper way to get more intake noise is removing the "3 litre milk bottle" white plastic resonator from the bottom of the stock airbox. If you stop there it will suck a bit of hot engine bay air but sound better. If you extend that bottom section (pictured below) with a 76mm silicone hose (and/or aluminium and/or bends) so that air is being drawn from a cooler area near the foglight you might draw some cooler air.

Image


Will be keeping the car for a year at most, so have set a budget of $2k max for mods.


That budget will be tight, so either the budget or the wish list will need to be flexible. If cash is king, just throw on a cat-back, delete the milk bottle resonator, spend any change on replacing worn items (and/or tightening up suspension) and be done with it.

Good luck with it all.
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Re: MY09 4GEN GT-B Auto - Most Cost Effective Upgrades?

Postby Stifull » Fri Jan 06, 2023 11:24 am

I agree with Yowie. $2000 is an awkward amount because the upgrades that provide the most increase need a $1000 tune which doesn't really leave enough for the performance upgrades like, as mentioned, down pipe etc. Removal of the resonator milk bottle is always a good one because it's only reason for being there is to make the car quieter...LOL.. What were they thinking. I think the issue is that you are not keeping the car. Personally I buy cars with no though of ever only keeping them for short periods of time. My GT is built to last and go fast for as long as I live.. Same as with my Rex..No plan of ever selling either.. Or my 4wd.. I spent $5k on GT on new and 2nd hand goodies for my GT and achieved a 50% power increase at only 16lb of boost.. In your case I would just do a cat back and resonator delete and as mentioned spend the couple of dollars left from $2k on maintainance.

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Re: MY09 4GEN GT-B Auto - Most Cost Effective Upgrades?

Postby newbie_liberty » Fri Jan 06, 2023 2:27 pm

Yeah, I know what guys mean!

I'm just trying to restrain myself from spending big $ on this when overall, it's going to still be slower than my previous few daily drives. :lol:

Besides being a bit laggy when off boost, it has adequate power (...for now)!

I'll give the 'milk bottle' mod a go over the weekend.

As for the exhaust, I think I'll grab the Xforce catback for now and have a go at fitting it myself.
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Re: MY09 4GEN GT-B Auto - Most Cost Effective Upgrades?

Postby bigBADbenny » Fri Jan 06, 2023 11:59 pm

I recommend Btssm app, for monitoring engine tune, virtual gauges/alarms eg coolant temp, datalogging and ecu learning view, diagnostic codes and ecu reset.

viewtopic.php?f=56&t=27506

Because it’s always good to know if the engine is running properly whether tuned or not!
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