WHAT/WHY:- Removed the front rubber strip from the bonnet underside, to improve the airflow into the 'box.

COST:- FREE!!!!

HOW:- I left all the clips in the bonnet just removed the rubber from the clips (to get it off; GENTLY stretch the rubber to one side of the clip, then the other - just like pants)

RESULTS:- More induction noise, Power increase = NFI (only had the car a day)


Makes me happy as I've managed to mod it somehow.....Ill add pics later (maybe!)


Disclaimer: I have NFI, if you have NFI, pay someone who does.

WHAT/WHY:- Removed the front rubber strip from the bonnet underside, to improve the airflow into the 'box.

COST:- FREE!!!!

HOW:- I left all the clips in the bonnet just removed the rubber from the clips (to get it off; GENTLY stretch the rubber to one side of the clip, then the other - just like pants)

RESULTS:- More induction noise, Power increase = NFI (only had the car a day)


Makes me happy as I've managed to mod it somehow.....Ill add pics later (maybe!)


Disclaimer: I have NFI, if you have NFI, pay someone who does.

So what's your next plan? Working on the minimalistic dollar approach it would have to be the 90mm intake! Then maybe exhaust/extractors .... more dollars but huge gain!

a free mod is a good mod though :badgrin:

my engine bay gets covered in crap even with both rubber strips in place cause water seems to get in past them ive had it steam cleaned so many times.

380GT, Naice. :)

My total list of mods will be something like (not in any order);

Removal of rubber strip - DONE
90mm intake snout
K&N panelfilter
Extractors of some sort
Redback straight-through resonater/muffler
Window tint

Is the Dyno sheet shown elsewhere on this forum a before or an after modding and what was done to get it there?

The thread "Dyno Charts" has got all that info from guys who have done all these mods already.
I would recommend to you what has been recommended to me, to do the exhaust first; primarily just the rear muffler - and there is a thread on this too! - then the intake, then the filter. Apparently the increases won't be felt until the exhaust is done first.

I performed this simple mod of removing the rubber strip, the front one which obstructs the intake snorkel. After a lengthy cruise today, I can say it makes no difference at all; not with noise or acceleration - but I have already done the other mods of muffler and intake. Perhaps its removal is better for the original snorkel, not the 90mm one.
I also noticed how dirty the engine was WITH the strip... can't imagine how much worse it will be without it, so will probably put it back as it didn't make any difference anyway.
Has anybody else done this (with the other mods)?

I performed this simple mod of removing the rubber strip, the front one which obstructs the intake snorkel. After a lengthy cruise today, I can say it makes no difference at all; not with noise or acceleration - but I have already done the other mods of muffler and intake. Perhaps its removal is better for the original snorkel, not the 90mm one.
I also noticed how dirty the engine was WITH the strip... can't imagine how much worse it will be without it, so will probably put it back as it didn't make any difference anyway.
Has anybody else done this (with the other mods)?

Yep I cut out the bit in front of the snorkel, didn't notice any difference either but it all must help i think. Even if it is 1HP it's better than nothing, all these little bits can add up!

Yep I cut out the bit in front of the snorkel, didn't notice any difference either but it all must help i think. Even if it is 1HP it's better than nothing, all these little bits can add up!
I agree. If its letting more air in, its got to be a good thing even if you dont feel the difference. (The air filter is stopping the dirt etc from getting into the engine). Its a bit like a K & N, doesnt make the car go any faster but is apparently good for about a 1 kw. These 1 kw's all add up, particularly with other mods to eventually give a noticable improvement.

And by the way, Merry Christmas guys!!!!!!

When i did this with the 90mm intake i noticed more noise... Not much more. But as was mentioned earlier if there is but 1 kw in it then 1 kw for free is a good thing! :D

Not even a gain in fuel economy from any of the induction mods?

Not even a gain in fuel economy from any of the induction mods?
lol Not with mine!

No I didn't find any improvement (for better or worse) to economy after the intake change, either.

There's been a definite power gain for the 90mm intake - +13 hp on the dyno for me.
Minor changes that affect the intake I think have a very high probability of being positive for power and fuel economy. I base this opinion on the changes I did on the last dyno session, for example removing the plastic engine cover gained an extra 2hp - a measurable and repeatable mod.

The thing is tho, you won't feel any difference for a gain of 1 or 2 hp, or even 5-10hp in some cases. This is because of many reasons, one is the gain in comparison with total power is very small. Second, the power delivery is very smooth in a heavy car - tends to mask minor changes. Third, conditions on the day i.e. hot temperatures, may affect total power output and again hide any small gain.

On the other hand when I changed my airfilter to a K&N, which theoretically gained me only 3-4hp, I felt a significant difference in response. So some mods may have a larger potential to be felt depending on how the car/ECU deals with them.

Fuel economy, again, is difficult to accurately judge whether improvement has been made. Mine certainly is markedly better, but that's from the cummulative result of a number of changes. I don't think cutting the bonnet rubber is going to measureable (I've also done this mod).

Other mods will definitely have an effect, for instance, the installation of an interceptor. Changing the air fuel ratio will definitely produce better fuel economy, but probably not as much if the 90mm intake and K&N filter were not fitted.

All the mods are cummulative.

Minor changes that affect the intake I think have a very high probability of being positive for power and fuel economy. I base this opinion on the changes I did on the last dyno session, for example removing the plastic engine cover gained an extra 2hp - a measurable and repeatable mod.
Are you referring to the grey plastic panel as seen in my avatar? If so, is that easy to remove?

Are you referring to the grey plastic panel as seen in my avatar? If so, is that easy to remove?
If its like any other engine cover it should be held in with a few bolts of i reckon 10 or so mm

There's been a definite power gain for the 90mm intake - +13 hp on the dyno for me.
Minor changes that affect the intake I think have a very high probability of being positive for power and fuel economy. I base this opinion on the changes I did on the last dyno session, for example removing the plastic engine cover gained an extra 2hp - a measurable and repeatable mod.

The thing is tho, you won't feel any difference for a gain of 1 or 2 hp, or even 5-10hp in some cases. This is because of many reasons, one is the gain in comparison with total power is very small. Second, the power delivery is very smooth in a heavy car - tends to mask minor changes. Third, conditions on the day i.e. hot temperatures, may affect total power output and again hide any small gain.

On the other hand when I changed my airfilter to a K&N, which theoretically gained me only 3-4hp, I felt a significant difference in response. So some mods may have a larger potential to be felt depending on how the car/ECU deals with them.

Fuel economy, again, is difficult to accurately judge whether improvement has been made. Mine certainly is markedly better, but that's from the cummulative result of a number of changes. I don't think cutting the bonnet rubber is going to measureable (I've also done this mod).

Other mods will definitely have an effect, for instance, the installation of an interceptor. Changing the air fuel ratio will definitely produce better fuel economy, but probably not as much if the 90mm intake and K&N filter were not fitted.

All the mods are cummulative.

Strongly agree with Knotched's comments. I too got a K & N today and the difference in response was very significant...I would say more noticable than the 90mm intake. Rocket Industries now have K & N's in stock & would highly recommend to anyone with the bigger intake to get one.

for example removing the plastic engine cover gained an extra 2hp - a measurable and repeatable mod.
Since this small gain was from allowing the manifold/intake to run a bit cooler we could always do what we used to do in the old days, a few washers under the back bolts on the bonnet hinges to get some airflow through under the bonnet. Less heat - more power.

Since this small gain was from allowing the manifold/intake to run a bit cooler we could always do what we used to do in the old days, a few washers under the back bolts on the bonnet hinges to get some airflow through under the bonnet. Less heat - more power.
Like the old Falcons used to do (XB, XC, etc). Or just pull the in-car catch for the bonnet, and then start driving! lol

..I too got a K & N today and the difference in response was very significant...I would say more noticable than the 90mm intake. Rocket Industries now have K & N's in stock & would highly recommend to anyone with the bigger intake to get one.

Hey that's great :D

So it's a lot different now than when you first had one?

Hey that's great :D

So it's a lot different now than when you first had one?
When I ran a K & N with the original intake, I didnt notice any change at all in fact it felt like it had a slight miss or flat spot. The difference however now with the 90mm intake is remarkable...I think you wrote the K & N removes the 'doughy' feeling, well it certainly did that with my car. Definetely the sharpest its ever been & that was on a hot afternoon.

You also previously mentioned that the K & N we use is made for the US Galant which has the 90mm intake so it makes sense they work very well together.