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2007 Holden Captiva CG LX 3.2LTR
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19 Posts
Discussion Starter · #1 ·
About to upgrade from stock. Have been recommended to move up to 2.5inch catback replacing postcats
to hiflo and rear mufflers to resonators. Looking for better economy and performance obviously but worried about too much noise.. keep rear mufflers??
 

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2007 Holden Captiva CG LX 3.2LTR
Joined
19 Posts
Discussion Starter · #3 ·
Don't do it, this is crazy talk, if you have too much money give it to charity.馃槮
Need to replace Cats amyways John so was the first reason for doing.. can you make a suggestion of budget alternative??
 

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"Looking for better economy and performance"

Generally these two simply just dont go hand in glove.

I've seen your other post of your 'Mods'. I'm starting to think you maybe should have purchased a vehicle with everything to your speci in the first place; but hey if it is keeping you out of mischief ! ;)
 
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Registered
2007 Holden Captiva CG LX 3.2LTR
Joined
19 Posts
Discussion Starter · #5 ·
Need to replace Cats amyways John so was the first reason for doing.. can you make a suggestion of budget alternative??
Don't do it, this is crazy talk, if you have too much money give it to charity.馃槮
John
Don't do it, this is crazy talk, if you have too much money give it to charity.馃槮
"Looking for better economy and performance"

Generally these two simply just dont go hand in glove.

I've seen your other post of your 'Mods'. I'm starting to think you maybe should have purchased a vehicle with everything to your speci in the first place; but hey if it is keeping you out of mischief ! ;)
Bought the car 6 years ago and it's owed us nothing for some time. Never let us down so thought I'd dress it up for my sons first car. So far he loves it and now so do I!
 

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Lacetti 1.6 2008
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24 Posts
The only way to convince yourself that the new exhaust is better than the previous one is to do a before and after dyno torque graph and compare the results. A friend lost torque after switching from stock to free flow exhaust even if it had turbo. I can assist in acceleration time calculation based on those torque graphs.
 

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Hi Davidaj73,

I'm in no way an exhaust expert but just wanted to chip-in here.

If time, circumstances and funds allows, is there an exhaust specialist/designer/creator who could look into this for you? Years ago I had an MR2 Turbo and threw some cash at it. One mod was a blueprinted exhaust that removed the cat - and rear mufflers. Being mid-engine, the 'noise' was restricted in the cabin but not outside. Setting off car alarms in multi-storey car parks was fun, but I was young!

When kids came along I went the sensible route and a Subaru Impreza - which had similar treatment. But only one of two cats was removed (the main one) and I asked for a sound (volume) which was 'there' but not overwhelming. Even at 90-95 max dB, cruising speeds were often tired by constant cabin rumbling. Granted, the Impreza's sound-deadening wasn't the best which didn't help.

I guess what I'm trying to say is, if you have an outfit who knows their stuff you can have the economy Vs performance Vs NOISE sorted out properly. Maybe forget the economy part though ;)

Jonty.
 

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2007 Holden Captiva CG LX 3.2LTR
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19 Posts
Discussion Starter · #9 ·
Hey Jonty. Really appreciate your reply.. thankyou. Seems some on here are just out to share their isolated opinion with little if any understanding to constructive discussion!

I understood you and your experience. I'm in my 40s now and went through a similar youth. This car is for my young son now and his interests for modification are similar to what mine were surprise surprise.

I've since had a system installed by a reputable local exhaust installer. 2.5inch Cat back. Removed rear cat. Splits to 2inch with hotdogs (resonators) at rear. Sounds great. Low deep humidity from start up, barks a little from 4000 revs then cleans out to a smooth v6 rev after that. Only adjustment to make is from minor cabin drone frim rear when cruising at 70km. I'll be trying sound proof mat for that. Otherwise as expected everything improved.. including economy it seams! Very happy with result.

Photo attached 馃憤
1973
1974
 

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Ooh, lovely :)

I can imagine the V6 note is lovely through that. Sadly only 4 cylinders over here in the UK. All the best with the fine-tuning!

Jonty.
 
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