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Mine wasn't just the peak gain, my torque and power were higher across the whole graph, particularly down low and up top (at around 3500RPM I didn't get as much gains, but before and after that everything was a lot higher). There was a big gain in torque even at 2000RPM.
That being said, if I had the money, I'd definitely go forced induction..
I'm in country Vic and I don't do a lot of driving so I haven't been hassled over the exhaust, it's quite easy to keep it sounding respectable if you are light on the throttle. It's when the car is under load or at high revs that it starts to get louder.
Yes agreed about the driveability but 30 kw at peak is subjective pending on weather temp and which dyno used.. If your chasing numbers then it sound/looks impressive from just a tune.. but street driving is all about bottom and mid range in my opinion..[just mine] Both points are valid pending each individual use, at the end of the day its all about how deep is your pocket ..
A tune imo is definitely worth it, my car had throttle lag when warm, and this was solved with a tune (don't bother with a Sprint Booster, etc, these will only trick your car into thinking you're pushing the pedal harder, which wouldn't fix lag). I had a 30kW gain at peak power, but for me it wasn't about numbers and it was about getting some driveability back.
That being said, I do agree that forced induction is the way to go if you really want some big gains. The lag is a bit of a different issue to yours, but is still well worth looking into.
For my intake, the car felt smoother throughout the rev range (this was before the tune), but nothing dramatic. I only got one because it was cheap, even my exhaust and HFC didn't make any noticeable difference before the tune, but I felt it would be a waste to get a tune without some breather mods. I wouldn't be looking at these yet, unless you want to get the most out of your tune (but then you have to draw a line, there's obviously other parts you can throw at the car)
For the throttle bodies, give them a shot but avoid touching the actual throttle plates unless you've done research into how much they will cost to get them re-calibrated.
I do know some people have touched them without any issue, but your experiences may vary. I had mine cleaned on each side of the plate (without opening the plate) when I had my spark plugs changed (which made a mild difference, but like the intakes, nothing dramatic).